Looking lovely this spring has been our patch of Marshall’s Barbara’s Buttons, Marshallia caespitosa. This cute perennial hails from prairies from Missouri south to Texas and will be available this fall. Hardiness is Zone 5a-8b.
Tag Archives: native groundcovers
One of the newest discovered species of our native asarum (formerly Hexastylis) is Asarum finzelii, from northeastern Alabama. In foliage, the plant resembles both Asarum arifolium and Asarum speciosum. The flowers, however, are quite different from both, as you can see below. It is our hope to get this propagated before too long, so we can work to make it more widely available.
Much ado about Memminger’s Heartleaf Wild Ginger
This spring, we flowered the highly confused NC native wild ginger, mistakenly known as Asarum memmingeri in the garden. In reality, it’s never been given a proper name, so we refer to it as Asarum sp. nov. Allegheny Wild Ginger. Below, Patrick explains how this ginger was dropped into a botanical abyss, and what needs to be done to return it to proper recognition, and to correct a cascade of past taxonomic errors. -ta
When I was a boy the tiny-flowered evergreen wild gingers that grew all over our land in Alleghany County, North Carolina seemed like they must be a common species, and should have a name. As a boy of 12, however, I had a hard time placing a name on them since they didn’t seem to fit the photographs in popular wildflower books or match the plants that my grandmother’s flora called Hexastylis virgnica (now Asarum virginicum).
I became obsessed with heartleafs as a child and the curiosity remains strong. When I entered college I was lucky enough to take Dr. Peet’s Ecological Plant Geography class at the University of North Carolina, Chapel Hill. Our class, which was all graduate students and me (as a sophomore), was expected to do a project detailing and explaining the range of a particular genus or family of plants. I chose the smooth-leaved evergreen Asarum, then known then as Hexastylis.
I spent the spring semester travelling to every corner of the American South seeking species I didn’t know and trying to fill in the vacant counties in the range maps of those species that I did know. I took countless measurements of calyces and made copious notes on habitat. I was shocked when I travelled to southeastern Virginia to visit the area where Asarum virginicum was likely first collected. These true Asarum virginicum plants were nothing like the “A. virginicum” I was so used to seeing in my boyhood home.
A quick trip to the Earl Core Herbarium at West Virginia University, and later to the Smithsonian, brought to light a serious problem with what botanical taxonomists currently refer to as Asarum virginicum and an even larger problem with what we call Asarum (Hexastylis) rhombiformis and Asarum (Hexastylis) memmingeri.
It seemed as if the Alleghany County plants I had called Asarum virginicum as a child had been mistakenly identified by WVU taxonomist Earl Core as Asarum memmingeri. Complicating this further was that the probable original type specimen for A. memmingeri would later be published under a new name, H. rhombiformis!
To make sense of the cascade of errors, we need to go back further in time. This story begins in 1897 with W.W. Ashe’s publication of The glabrous-leaved species of Asarum of the southern United States in the Journal of the Elisha Mitchell Scientific Society. Here, Ashe describes for the first time Memminger’s Heartleaf (A. memmingeri). From the description it is obvious that he is describing a plant with a very small flower with a very narrow opening (7 mm wide or less).
Error #1 occurred when Ashe described the original type locality as Mitchell County, based on a collection by E.R. Memminger. When I was looking for a type specimen, the best option I could find was a specimen collected (in duplicate) by E.R. Memminger himself that he says in his own handwriting represents the type location. During Ashe’s time, it was not required to designate a type specimen, but the problem was that Ashe’s citation of Memminger’s specimen was actually from Henderson County (“Tranquility”, Flat Rock, NC), not Mitchell County.
Type specimen of Asarum memmingeri collected by E.R. Memminger
Error #2 occurred as we fast-forward to 1987, ninety years after Ashe published his work, when L.L. Gaddy described a new species of Hexastylis that occurs in Southwestern NC and Northwestern SC as H. rhombiformis (Asarum rhombiformis (combination not yet made). In this description he cites E.R. Memminger’s specimen from Henderson County, which, is actually the type specimen of Asarum memmingeri as representing his new species H. rhombiformis. Consequently, the name H. rhombiformis is invalid and this plant should be known as A. memmingeri.
Error #3 occurred when J.K. Small of the New York Botanical Garden, Earl Core of West Virginia University and others annotated (attributed) numerous Asarum collections from West Virginia, Virginia, and NC, of an un-named species that they mistakenly identified as A. memmingeri. Blomquist and all modern authors have since combined these tiny-flowered plants with small openings to the calyx tube within a “catch-all” concept of A. virginicum. Other taxonomists since have followed their mistaken identification of A. memmingeri or A. virginicum for these plants that are known to range from WV south to NC.
We know that these plants that J.K. Small, Earl Core, and others called A. memmingeri actually represent the heartleaf from my Alleghany County childhood homestead and surrounding regions that still has no accepted name.
It is time to clear up the confusion and formally describe these plants along with a new, correct scientific name. For our purposes we will refer to them here as Allegheny heartleaf for a common name (in reference to the mountains, which have a different spelling than the NC county, rather than Alleghany County, NC).
In vegetative form, the Allegheny heartleaf is similar to most of its relatives including A. virginicum, minus, heterophylla, and naniflora. They are tightly clumping with leaves that tend to be as wide or wider than long with a broad cordate base. Though I have found populations with some mottling on the leaves, they tend to lack any variegation altogether.
The flowers on the undescribed Alleghany County heartleaf are much smaller in all dimensions and also differ in the tube constriction from both A. virginicum and true A. memmingeri.
The Allegheny heartleaf is found in typical heartleaf habitat: highly acidic, organic duff beneath oaks and pines and often in association with Rhododendron and Kalmia. They are found along the margins of Southern Appalachian fens and small stream swamps as well as along stream banks and on steep rocky slopes and bluffs that are most often north or east-facing.
The natural range of the species seems to be from Watauga/Avery counties North Carolina, north through West Virginia at low to moderate elevations. In North Carolina nearly all populations are located along the New River drainage, though there are outliers along the Yadkin River drainage downstream to Donaha Bluffs in Forsyth County. This taxa is tightly tied to the Appalachian range with outliers into the piedmont in areas with cool microclimates along rivers that originate in the mountains. Between the mountain populations of Allegheny Heartleaf and the coastal Virginia Heartleaf (Asarum virginicum) occurs A. minus, which largely replaces Allegheny Heartleaf in most of the piedmont of North Carolina.
Allegheny Heartleaf was very difficult for me to grow, even in seemingly hospitable microclimates in Clemson, South Carolina. It seemed to survive but only for a short time, gradually declining and producing dwarfed leaves by the 2nd season and then disappearing by the 3rd. I am extremely pleased to have this species growing strong, flowering and producing normal sized leaves for its second season here at Juniper Level Botanic Gardens.
What needs to happen is for Hexastylis rhombiformis to have a name correction to Asarum memmingeri, and for the plant widely known as Asarum memmingeri to finally be named for the first time, hopefully with a specific epithet named for the Allegheny Mountains, which incorporate the heart of its range.
A Fine Yellow Bird
Our clump of Hans Hansen’s hybrid, Baptisia ‘American Goldfinch’ looked quite outstanding this April. This is a 4 year old clump from a 1 quart pot. Hardiness is Zone 4a-9b.
Looking lovely now is the new NC selection of the native (Pennsylvannia to Tennessee) woodland groundcover, Meehania cordata ‘Roby Rose’. This lovely light pink selection of the typically purple-flowered species was discovered by our friend, NC plantsman Mark Rose, who allowed us to introduce this to commerce.
Our patches of the evergreen radiating sedge, Carex radiata, are looking lovely in the spring garden. Ranging natively from Canada south to Louisiana, our plants are from a NC population in Halifax County. Although they will tolerate full sun, they are best in light open shade.
Looking great for the last few weeks in the woodland garden is Iris cristata ‘Eco Orchid Giant’. This native gem matures at only 6″ tall, but puts on a splendid early spring show in the garden. Hardiness zones 3a to 8b.
Very Wet behind the Ears
Despite the impending flooding late last week, Patrick, Zac, and I took off to the mountains of western South Carolina for a few days of botanizing. Despite the monsoon-like rains, we managed to visit seven amazing sites. Below is a highlight.
One stop was at a giant granitic outcrop. The rocks are covered in an array of mosses, lichens, and other associated flora, most growing in shallow pockets or organic debris that alternation from inundated to bone dry for months.
Large patches are covered with the colorful, 1″ tall, annual sedum, Diamorpha smallii, commonly known as Elf orpine.
Another site also had large granite flatrocks, but with a complete different flora. Here, two dryland ferns, Cheilanthes lanosa and Cheilanthes tomentosa formed large patches, along with the amazing Selaginella tortipila.
The more shaded slopes were filled with amazing clones of the dwarf painted buckeye, Aesculus sylvatica, which at this site, mature at only 3-5′ in height. In most other area, the same species matures at 10-20′ tall. The flower colors here ranged from peachy yellow to screaming orange red.
One of our next stops was an amazing watershed where, Shortia galacifolia grows by the acre, carpeting the mountain side. This is the world’s largest population of this amazing native. We even found it growing epiphytically on a rock, perched in the middle of a stream.
The native Micranthes micranthidifolia grew along the moist stream banks. This is the first time I’ve seen this, since I first purchased the plant back in 1995 from the former We-Du Nursery. In that case, I killed it, before getting it planted.
Another plant I’ve killed in my previous attempt was the native climbing fern, Lygodium palmatum. Here, it grew with the easy-to-grow Christmas fern, Polystichum acrostichoides.
The difficult to grow Asarum heterophyllum was scattered throughout our several mile trek, almost all plants were the solid green leaf form.
Far easier to grow is the native Hydrangea radiata (formerly known as H. arborescens var. radiata), with its shimmering white-backed leaves.
As we walked along the towering cliffs, the red fruit adorning the carpets of partridge berry, Mitchella repens glistened in the rain.
Several patches of mayapple, Podophyllum peltatum had some of the largest foliage that I’d ever seen, measuring 1′ in width.
Not far away we saw some of the most strikingly patterned form of Pachysandra procumbens we’ve ever seen.
We almost got through the entire trip without finding a single variegated or colored foliage mutant, when not far from the parking area, we spotted a streak sport on Kalmia latifolia.
Below is our incredible, but soaking wet, botanizing team (l-r) Adam Black, Bartlett Arboretum, Zac Hill, JLBG, Patrick McMillan, JLBG.
Many gardeners tend to ignore the narrow leaf Trillium lancifolium in favor of the larger, more impressive species, but we think this smaller toadshade is quite garden worthy. Below are two clones we’ve named and introduced in the past. One is in full flower here at JLBG, and the other is right behind in mid-March. Hardiness is Zone 6a-9b.
Those of us who have studied trilliums extensively in the wild, feel that all Trillium lancifolium are not created equal. In other words, what is currently known as Trillium lancifolium is most likely 2-3 different species. These are botanically known as cryptic species, since they are hiding in plain site. Advances in DNA now allows researchers to confirm field observations, so don’t be surprised if you see more new trillium species being named from this complex.
The first image below is Trillium lancifolium ‘Lancelot’, a selection from North Florida that forms dense clumps, compared all of the other plants from this population, which grew as solitary stems. The flowers are also butterscotch instead of the typical purple.
Trillium ‘Black Panther’ is a JLBG selection from a cross of genetics from a Florida population with a Tennessee collection. It also forms dense clumps.
Still Pulling More Toothwort Images
We love the amazing winter flowering toothworts of the former genus, Dentaria. The latest taxonomic work moves these into the genus Cardamine, which means quite a few tag changes here at the gardens. It’s fascinating that more native plant nurseries don’t have a better offering of these amazing plants.
Flowering below this week are two of our collections from a botanizing expedition to Arkansas a few years earlier. The first is a very nice, compact form of the native Dentaria laciniata from Yell County. Below that is a new, un-named species that we discovered in Montgomery County, Arkansas.
Carpet’s of White
Here are a couple of groundcovers that are looking nice in the garden in early March. The first is the Western US native, Cerastium beeringianum (Western Snow in Summer), which is a close relative of the Italian Cerastium tomentosum. We selected this form from seed we grew, originally purchased from a native plant nursery as the US native, Arenaria stricta–oops! Both genera are at least members of the dianthus family, Carophyllaceae.
We’re still pretty excited, despite the misname, since this is an alpine species that typically grows above 10,000′ elevation. We’ve added the name ‘Southern Snowstorm’ to this exceptional clone.
Below is the Balkan native, Arabis procurrens. This member of the Brassicaceae family makes a superb groundcover. Our 5 year old, well-behaved, evergreen clump pictured below is almost 4′ wide.
Blooming Jar Heads
Flowering in the garden this week is our Macon, Georgia collection of the southeast US native Asarum arifolium ‘Macon Jars’. Other forms of A. arifolium from further north in it’s range won’t be flowering for several more weeks. We trim the old anise-scented foliage of our asarums so we can better enjoy the amazing floral show of this native woodland perennial. The new leaves will emerge in just a matter of days.
Dentaria (Cardamine) diphylla ‘Burnsville Beauty’ is our 2008 collection of the native woodland groundcover, Dentaria (Cardamine) diphylla from a collection in Burnsville, NC. This selection stood out in the wild with much narrower and more pointed leaflets that any other clones we’ve seen. Since 2008, our division has grown into a 4′ wide patch. The foliage emerges in fall, flowers in March, and then goes summer dormant. We hope to release this selection for the first time next year.
Flowering now in the garden is the delicate toadshade, Trillium delicatum. This diminutive trillium, published in 2019, hails from Central Georgia, where it naturally grows in floodplains. Despite a damp habitat, it has performed beautifully for us, even in average to dry garden soils. This species is quite rare, and is suffering significant damage from feral hogs, making ex-situ conservation even more important. Our clumps are getting large enough for us to hopefully make divisions available within the next year.
Splurge with Allegheny Spurge
Flowering in the garden now is the wonderful US native Pachysandra procumbens (Allegheny spurge). Native from Indiana south to the gulf coast, our selection, Pachysandra ‘Angola’ comes from the woods near that well-know Louisiana prison. This stunning evergreen, variegated, slow-spreading, woodland groundcover, is quite different from its better known and much faster spreading Asian cousin, Pachysandra terminalis. The flowers are also sweetly fragrant, what more could you want? Hardiness is Zone 5a-9b.
A Bunch of Little Pricks
If you go through the garden slow enough, you’ll notice little treasures like the NC native, Opuntia drummondii. This tiny growing coastal native prickly pear cactus can be found from NC around the gulf coast to Mississippi. Our specimen was shared with us from a collection on NC’s Bodie Island–a name made famous as the place where the Wright Brothers took flight. This prostrate grower is great to keep animals from trespassing onto your property.
Up and Underwood
Our 2nd earliest trillium is up and almost ready to flower. The deep south native Trillium underwoodii is the second toadshade to emerge, only behind the Florida genetics of Trillium maculatum, which emerges here in December. Although there is plenty of cold remaining, Trillium underwoodii is able to tolerate multiple nights of hard freezes below 20 F after the foliage has emerged. Winter hardiness is Zone 6a-9b.
A Lumpy Pancake
I was just admiring our specimen of the East Coast native, Thuja occidentalis ‘Concessarini’ today. I find this a fascinating plant in the garden, sadly never promoted by those who claim to extoll the virtues of native plants.
Our oldest specimen below is now 10 years old and measures 3′ tall x 6′ wide…quite a bit larger than it’s introducer claims it to be at 1′ tall x 2′ wide. If you dig deeper, you’ll see that the plant patent application shows they only measured a three year old plant, and have never bothered to update the mature size in their marketing or on their tags. It shows how little many plant introducers think of the end consumer, when they set them up for failure by promoting these fake mature sizes. Commercially, it is marketed under the fake trade name of Pancake arborvitae. That’s one seriously lumpy pancake.
This juvenile-foliage sport of Thuja ‘Linesville’ was discovered by nurseryman, Gabriel Cessarini. We think it’s pretty cool, just allow enough room in the garden. Winter hardiness is Zone 3a-8b.
Houstonia…we have a great plant
Flowering in the garden this week is the fascinating, but little-known Houstonia procumbens. This Southeastern US coastal native (South Carolina west to eastern Louisiana) is a spreading, winter flowering bluet. We collected cuttings in Clay County, Florida in 2003, and this patch has been thriving in our sunny alpine garden since then, forming a 1.5′ wide patch.
A Melting Pot of Carex
We’ve published blogs about a number of carex from our rather large collection (108 species) several times this year, but here are a few more that look great here in early December. We have been fortunate to be able to collect members of this amazing genus from around the world, all of which now reside happily here at JLBG. As you can imagine, the majority of our collections are US native species, but just like with Homo sapiens, we value diversity and consequently don’t profile or discriminate based on ethnicity or origin.
The first is the US native Carex austrolucorum. This is Jeremy’s collection, named Carex ‘Tennessee Mop Top’.,
Carex gentilis ‘Yushan’ is our collection from Taiwan, and the only fall-flowering carex we know. Duke Gardens has made stunning use of this in their magnificent Asian garden expansion.
Carex ‘Silk Tassel’ is a stunning selection of the Japanese Carex morrowii var. temnolepis, brought to the US back in the 1970s by plantsman Barry Yinger. We still view this as one of the finest carex we’ve ever grown. While it grows great in shade, it truly excels in full sun, where its narrow variegated leaves appear silver.
Happy about Hepaticas
I’ve been very blessed on several UK visits to spend time at the amazing Ashwood Nursery of plantsman John Massey. One of the real treats of each visit is a chance to spend time in John’s private hepatica greenhouse. To say John is a bit obsessive about the genus is a grand understatement, so it should be no surprise that he has channeled all that knowledge into a new Hepatica book, that’s hot off the press.
We first learned of John’s obsession with the genus, when he joined us on a 2000 expedition through NC, SC, Alabama, and Tennessee to study the hepatica in the wild…along with our main goal of studying trillium. Below is an image from that expedition. Hepatica are also native to Asia.
Our copy of My World of Hepaticas arrived recently, and John’s book is a massive 296-page compendium of pretty much anything you’d want to know about hepaticas, compiled from John’s decades of work with the genus. John’s writing style is easily readable, coming across as if you’re having a relaxed conversation over dinner, and the incredible photos are an equal match to the text. Right now, you can only obtain a copy by ordering it from the Ashwood website.
Juniperus communis is a common landscape juniper with a wide natural distribution…one of the widest of any woody plant in the entire world.
In the North American part of its range, it’s widespread throughout the Western US, and across the northern tier of the country all the way to Maine. East of the Mississippi River, however, it’s virtually not-existent south of the Great Lakes.
Patrick McMillan had been telling us about a population he rediscovered from an earlier Henry William Ravenel (1814-1887) documentation of a single clone growing naturally in Aiken, South Carolina. Last week, we made the 4 hour drive to visit this ancient living fossil. Here is all that remains, growing in an amazing nature park, known as Hitchcock Woods, where it grows surrounded by a forest of Kalmia (mountain laurel).
We have this propagated and growing at JLBG, and hopefully in the future, when our plants get larger, we can share these amazing genetics with a wider audience.
Looking great this week are most of the desert ferns, especially the wonderful Cheilanthes tomentosa. So many folks still don’t realize that an entire group of ferns grow naturally in desert conditions, often alongside cactus. This fern favorite has a shockingly large and unusual distribution, from Arizona east to Virginia. We’re fascinated why this evergreen fern known as Wooly lip fern, isn’t more widely grown. Hardiness is Zone 6a-8b, at least.
Mid-October is flowering time for the widespread (Canada south to Texas) native oblong aster, Aster oblongifolius (aka: Symphyotrichum oblongifolium). This amazing plant forms a large clump to 2′ tall x 8′ wide. This is the clone Aster ‘October Skies’, which is quite similar to the other widely grown clone, Aster ‘Fanny’. Average to dry soils in full sun is the key to success. Hardiness is Zone 4a-9b.
Havin’ a Blast in the Fall
The shrubby North American native salvias including Salvia greggii and Salvia microphylla are spectacular plants in the fall garden. The same goes form the hybrids between the two species, known as Salvia x jamensis. Here is our clump of Salvia x jamensis ‘Blast’ looking absolutely stunning in late October. Flowering is heaviest in spring, slowing in summer, but again equaling it’s spring show in fall. Hardiness is Zone 7a-9b, and possibly a good bit colder.
Cow Tongue Takes a Lickin’
The gigantic, winter hardy, North American native, cow tongue cactus, Opuntia lindheimeri ‘Linguiformis’ is looking wonderful in the fall garden. We planted our original plant back in 2000, but when reworking a bed, needed to move it about 4 years ago. We took a couple of pad cuttings which languished, laying bare root on a bench for nearly 2 years. Despite this abuse, this is the result two years after those cuttings finally went in the ground. We find this to be the largest of the Zone 7 winter hardy prickly pear cactus, maturing around 7′ tall x 12′ wide. Winter hardiness is at least Zone 7b-10b, and perhaps colder.
Pir a whattia?
You go straight through to the round of botanical superstars if you recognize this little-known southeast native (SC to Florida), Piriqueta caroliniana. This Patrick McMillan collection from coastal SC has thrived all summer in our full sun rock garden, flowering constantly, with new flowers opening every other day. This oddity is a member of the Turneraceae family, which comprises nine other equally obscure genera. We’ve yet to determine if this will actually make a good garden plant, but evaluation continues. Hardiness north of Zone 8a is unknown.
Little Miss Sunshine
One of the stars of our late summer/early fall garden has been our selection of Chrysopsis mariana ‘Little Miss Sunshine’. We made this roadside collection of this East Coast native in 2020 in neighboring Orange County, NC, unsure of what we had collected, but loving the purple stems of this clone. This planting in our rock garden has produced an amazing 18″ tall x 2′ wide specimen that glows for months. Dry soils and at least half day sun are the keys to success. We’ll start propagating this showy, clumping native perennial in spring. Winter hardiness is Zone 4-8.
Willow the Wisp
Carex ‘Willow the Wisp’ is one of Zac Hill’s amazing collections from nearby Willow Springs, NC. This is a widespread native, naturally ranging from Michigan south to Florida and west to Texas. We love the appearance of a head of green hair…minus the head. In the wild, this selection of Carex leptalea var. harperi thrives in wet mucky swamps, like the story of Will-o’-the Wisp. We planted this in similar conditions in a seep at JLBG, where it has made this stunning specimen. Any plant that looks this good in October is undoubtedly destined for a future catalog.
Our 2008 introduction of a selection of our native Yucca x gloriosa ‘Lone Star’ has been absolutely splendid in the garden as the fall season begins. Yucca x gloriosa is a natural hybrid of Yucca aloifolia and Yucca filamentosa. We absolutely love that these flower spikes appear at a time when most other plants are past their seasonal prime. Winter hardiness is Zone 7a-9b.
St. Andrew’s Cross
How many folks are growing Hypericum hypericoides (St. Andrew’s cross)? The name translates to hypericum that looks like a hypericum….duuuh. We love this native shrub which hails from New Jersey southwest to Texas. St. Andrew’s cross typically matures at 2.5′ tall x 5′ wide and adorned from May through September with small, light yellow flowers, which form an “x”, hence the common name.
In the wild, Hypericum hypericoides is usually found in slightly acidic to slightly alkaline sandy soils, often in pine savannas, but in cultivation, they seem quite adaptable to an array of garden conditions from sun to part sun. In form, it resembles a Helleri holly with yellow flowers. The photo below is a 2 1/2. year old plant at JLBG. Winter hardiness should be Zone 6a-8b at least.
A Weeping Wonder
Few plants I’ve ever grown enchant me like Forestiera angustifolia ‘Woodlanders Weeping’. This incredible weeping selection of the Texas native is typically known as a scraggly upright bush that grows in dry alkaline soils. This special form was discovered in Calhoun County, Texas in 1992 by our friend Bob McCartney and the late Texas plantsman, Lynn Lowrey. In 1996, Bob, Lynn, and Patrick McMillan returned to the site for cuttings. It was subsequently propagated and introduced by Woodlanders Nursery. Surprisingly, it also thrives in moist acidic soils, and seemingly has no garden conditions where it doesn’t thrive.
We actually enjoy the incredible structure of the deciduous bare stems more in the winter time without the tiny deciduous foliage. The photo above was just taken at JLBG in late September. Mature size is 6′ tall x 25′ wide, so be sure you have a large enough space. I would think this is a plant that would be embraced by every native plant nursery, unless they have one of those bizarre hang-ups that man-made state political borders matter. Winter hardiness is unknown, but at least Zone 7b-9b.
Adiantum capillus-veneris ‘Bermuda Run’ is looking exceptional in the garden this fall. Actually, it looks exceptional most of the year for us. Until the temperatures drop below 12 degrees F, this amazing fern remains evergreen. This fern has a huge native range, being found on every continent except Antarctica.
Adiantum capillus-veneris, along with a couple of pteris fern species are often found growing in mortar cracks in many of the Southeast coastal cities and adjacent tropical islands. It is thought that some of these populations may have been spread along the early trade routes. This particularly dense form is our collection from the mortar walls on Bermuda. The same species is native to North Carolina, but only in a solitary population. Winter hardiness is Zone 7b-10b.
Raise your hand if you grow the woodland perennial, Collinsonia? These mostly fall-flowering, clumping perennials in the mint family (Lamiaceae) are wonderful elements for the woodland garden at a time when little else is flowering. Named by Linnaeus to honor English botanist Peter Collinson (1694–1768), the genus Collinsonia contains 11 species of which 4 are native to North America. Five species are native to China, 1 to Taiwan, and 1 to Japan. Pictured below in flower this week is Collinsonia punctata, which hails from South Carolina west to Louisiana. Winter hardiness is unknown, but we guess Zone 7a-9b, at least.
Now that fall has arrived, we’re all enjoying peak plume season for many of our favorite ornamental grasses. Unfortunately, there are a few significant mix-ups in the trade. The top photo is our native Eragrostis spectabilis, known as purple love grass. I’ve long admired this beautiful, but short-lived native, but have declined to offer it because of its propensity to seed around much too vigorously in the garden. In prairie restorations or less-tended gardens, it can be a spectacular addition. Hardiness is Zone 5-9.
Because most nurserymen aren’t plant taxonomists, you can perform a Google images search and find several on-line vendors who pretend to offer Eragrostis spectabilis, but show photos of the grass below, known as Muhlenbergia capillaris. Who knows which of the two they are actually selling.
If that’s not confusing enough, the plant below is known in the trade as Muhlenbergia capillaris or Gulf Coast muhly grass/pink muhly grass. The only problem is that this is actually a different muhlenbergia species. All of us have taken this name for granted, but as our Director or Horticulture/Gardens, Patrick McMillan taught us, all commercial plants labeled as such are actually Muhlenbergia sericea. We are updating our records and this name change will be implemented in the near future.
The misidentification originated with a Florida taxonomist, who mistakenly lumped three muhlenbergias together…a problem that can occur when you only study dead/smashed plants in a plant herbarium. As it turns out, the two plants, Muhlenbergia capillaris and Muhlenbergia sericea (also formerly known as Muhlenbergia filipes) are nothing alike.
The true Muhlenbergia capillaris is a rather homely plant that few folks would want in their garden. Muhlenbergia sericea, on the other hand, is a stunning ornamental plant, commonly known as sweet grass, and used for making those amazing hand-woven baskets that you find for sale in towns like Charleston, SC.
Such nomenclatural faux pas take decades, at least, for nurseries to get the names corrected since the public knows and purchases plants under the wrong name. This problem is far too common. The shrub, Ternstroemeria gymnanthera, was originally mistakenly identified as Cleyera japonica, and that mistake still persists over five decades later. Most gardeners despise name changes, often not realizing that many instances like these aren’t changes, but instead corrections of an earlier identification mistake.
You can learn more details about the mix up by reading Patrick’s article about pink muhly grass.
Palmetto State of Mind
We are pleased to announce that Dr. Patrick McMillan’s new book, A Guide to the Wildflowers of South Carolina, has been published. While Patrick taught at Clemson, he was approached to update The Guide to Wildflowers of South Carolina (Porcher), first published in 2002.
After studying over 200,000 herbarium sheets (dead, smashed plants), and making countless trips into the field to photograph and study the plants in habitat, the updated book, A Guide to the Wildflowers of South Carolina has been born. This amazing 613-page book is a dramatic update from 2002 version, complete with more images, completely revised distribution maps, and an additional 200+ plant species.
I have known Patrick for over 30 years, and we are so blessed to have him as our JLBG Director of Horticulture and Gardens. We are the beneficiary of his encyclopedic plant knowledge every day, but now everyone can benefit from that same knowledge through this amazing new book.
His new book, which has an official publication date of next month, is available through your favorite on-line bookseller. Whether you live/travel, or botanize in NC, SC, or any of the Southeastern states, you will find this book invaluable.
Reveling with Ravenel
I’d grown quite a few eryngiums…49 different ones, in fact, before Patrick shared Eryngium ravenelii with us in 2015. Who knew we were missing one of the best eryngiums in the entire genus! Today, Eryngium ravenelii holds several places of honor in our garden, where we can watch the myriad of pollinators who regularly stop by for a nectar snack during flowering season (mid-August to late September).
Eryngium ravenelii was named for American botanist, Henry William Ravenel (1814-1887). In the wild, Eryngium ravenelii grows in standing water in flooded ditches, alongside sarracenias (see bottom photo). We’ve now seen them in the wild in both North Florida and South Carolina, where they grow in calcareous-formed soils. In the garden, they thrive in an array of slightly acidic soils as long as the soil is reasonably moist.
Low Country Treasure Hunt
Last week, Patrick, Zac, and I spent a couple of day botanizing in the low country…i.e. Coastal South Carolina. In between swatting away the incredible troupe of mosquitos which chose to join us, we were able to capture a few images to share below.
The ancient lime sinks are fascinating. Here, old sinkholes due to subsurface limestone rock breakdown have collapsed, forming natural depressions, creating a habitat for our native pond cypress (Taxodium ascendens) and other fascinating wetland species…like alligators. Yes, we did see several, but they were too fast for our camera.
The high water marks are visible on the buttressed trunks of bald cypress.
Much of the region is, or was, a pine/grass habitat. The pines could either be longleaf (Pinus palustris) or slash pine (Pinus serotina) .The dominant grass is known as wiregrass, aka: Aristida beyrechiana.
On the dry sand ridges, we saw these piles of fresh sand adjacent to a nearby tunnel entrance. These are homes to the rare gopher tortoise, which live in the region. Patrick tells me these tortoises will use the same underground lair, which may stretch 40′ long and 10′ deep, for up to 60 years.
Gopher tortoises only emerge from their tunnels when temperatures are between 80 and 90 degree F. Sure enough, we were able to wait and get some images of these amazing creatures.
Another surprise spotting was a bright orange mutant katydid. Our entomologist Bill Reynolds tells me these are crazy rare, and worth well north of $1000 to collectors. Who knew?
Yes, we also saw some cool plants. Asclepias obovata is a little-known milkweed that’s quite rare in South Carolina, so it was great to catch it in flower.
At another site nearby, we caught some late flowering plants of Asclepias tuberosa var. rolfsii.
We visited several patches of amazing pitcher plants, one site with a tremendous variation of Sarracenia flava, which is typically solid yellow. Other sties had three species growing side by side including Sarracenia minor, Sarracenia rubra, and Sarracenia flava. It’s great that such natural area still exist, although they are always in danger from those who sadly dig plants from the wild for sale.
A plant often seen near the pitcher plants is the native orchid, Plantanthera ciliaris.
We were thrilled to find a couple of large patches of the scrub palm, Serenoa repens, from one of the coldest natural populations, which happened to be in full seed. Clonal patches like this are incredibly slow-growing. Researchers in Florida found that such clonal patches are often between 5,000 and 10,000 years old.
It was great to see large drifts of one of our finest native ferns, Thelypteris kunthii, aka: maiden fern. This superb deciduous fern thrives in both sun and shade, tolerating everything from wet to average soil conditions.
A lovely surprise was stumbling on a population of Hamamelis henryi. This coastal species is often listed as a variety of Hamamelis virginiana, but we think it’s probably deserving of species status. Several of the clones we found had lovely dusty blue foliage.
One of the most amazing shrubs was the hawthorn, Crategus munda var. pexa. These ancient specimens topped out at 4-5′ tall, and looked like ancient bonsai specimens.
I’ve long had a penchant for finding gold leaf sweet gums, and this trip added another one to the list. When many woody plants are cut to the ground, they are much more likely to produce mutations as they re-sprout. In my experience, the genus Liquidambar must be the most prone to such mutations.
The fall-flowering Georgia savory, Clinopodium georgianum was in full flower. We’ve grown and offered this for decades, but it was fascinating to see the flower color variation in the wild.
At one stop, we found five different liatris species, including the little-known Liatris elegans.
The native vining legume, Centrosema virginiana, aka: butterfly pea, was in full flower and looking lovely…first cousin to the better known genus, Clitoria.
I’m not a fan of most smilax species, but I was quite smitten by the non-running dwarf Smilax pumila, which grew in the shade like an Asarum (wild ginger). While some clones had green leaves, others had patterns every bit as good as the best Asarum.
On the ride home, we kept ourselves amused unscientifically researching the fastest speed at which leaf-footed bugs could hold onto a car window while copulating. Since our test speed topped out at 65mph, we aren’t sure what it was take to pry these loose, but perhaps someone should research how they are able to hold on so tight, as I’m sure it has numerous industrial applications.
We were saddened this past week to hear of the passing of our friend, Dr. Larry Mellichamp, age 73, after a three year battle with bile duct cancer. I first met Larry in the late 1970s, when he spoke to our Horticulture Club at NC State. Over the next 45 years, we interacted regularly, mostly during his visits to JLBG.
Knowing that Larry was in the battle of his life, we visited him at his wonderful Charlotte home garden last year (photo below). Even while he was ill, his wit remained razor sharp, and his humor as dry as the Sahara desert.
Not only did Larry teach for 38 years (1976-2014) at UNC-Charlotte, but he also managed the 10-acre UNC Charlotte Botanical Garden, which he turned into a must-see horticultural destination. Larry was a huge advocate of interesting plants, especially US natives. He was constantly dropping off new plants for us to propagate and share with a wider audience.
Larry was best known worldwide for his work with carnivorous plants, particularly with the genus Sarracenia. His “little bug” series, (Sarracenia ‘Lady Bug’, ‘June Bug’, ‘Love Bug’, and ‘Red Bug’, released in 2004, was the first widely marketed collection of pitcher plants, from his breeding work with the late Rob Gardener. In 2021, Larry was the recipient of the Lifetime Achievement Award from the International Carnivorous Plant Society…one of many such awards Larry received.
Larry was also a prolific writer. His books include: Practical Botany (1983), The Winter Garden with Peter Loewer (1997), Wildflowers of the Western Great Lakes Region with Wells/Case (1999), Bizarre Botanicals with Paula Gross (2010), Native Plants of the Southeast (2014), and The Southeast Native Plant Primer with Paula Gross (2020).
Larry and I connected on many levels, but we were both strong advocates for making rare native plants available for propagation and commercialization…something that is sadly the exception in the current world of botany. We hope others in the native plant community pick up the torch.
Larry is survived by his wife of 48 years, Audrey, his daughter, Suzanne, and a host of plants he spread throughout the world. Life well lived, my friend.
Memorial donations may be sent to the Foundation of the Carolinas for the “Mellichamp
Garden Staff Enrichment Fund”, 220 North Tryon Street, Charlotte, NC 28202. For bank transfer instructions contact firstname.lastname@example.org or 704-973-4529. All are invited to share memories and photos of Larry at https://link.inmemori.com/mDPxXH . A public memorial service will be planned for October at the UNC Charlotte Botanical Gardens. Look for an announcement on their website.
A rosea by any other name would look as sweet
We think Juliet would agree that Cuthbertia rosea is one sweet perennial. Looking great now is the southeast native (Maryland south to Florida) spiderwort, Cuthbertia rosea, which for us, begins its flowering season in spring, and continues sporadically through the summer months. Native primarily to dry sand, this easy-to-grow perennial has exceptional drought tolerance. Like all spiderworts, the flowers open in the morning and close each evening.
This poor plant has long suffered from an identity crises due to dueling taxonomists. This poor plant is also known as Callisia rosea, Tradescantia rosea, Phyodina rosea, and finally Tripograndra rosea. Despite the naming conundrum, it’s surprising that more people don’t grow this amazing plant.
Water Spider Orchid
One of the little-known of the native orchids is flowering now at JLBG. Habenaria repens, aka: water spider orchid, is the most widespread (NC to Texas) of the five native habenaria species. This charmer has been at home in one of our bogs for several years and has proven quite easy to grow. Hardiness is probably Zone 7b-10a, at least.
Purr-fect Pussy Toes
We love the miniature silver mats of Antennaria parviflora (little-leaf pussytoes). This little-known North American native (Canada south to Arizona) forms a tiny, 1″ tall groundcover that’s hard to the touch. In spring, the patch is topped with short fuzzy spikes of brush-like white flowers. The plant below, which measures 1′ in width, is only 18 months old from seed, and is growing in our rock garden in a well-drained mix of 50% Permatill. Hardiness is Zone 4b-7b.
As gardeners around the country are encouraged to plant more asclepias to encourage monarch butterflies, many folks are finding out that not all species of asclepias make good garden plants. As a genus, asclepias consists of running and clump forming species. There are number of horribly weedy garden plants like Asclepias speciosa, Asclepias syriaca, and Asclepias fasicularis. These plants are fine in a prairie garden, but are disastrous in more controlled home gardens.
One of our favorite clumping species is the easy-to-grow, Arizona-native Asclepias angustifolia ‘Sonoita’. This superb species was shared by plantsman Patrick McMillan. It has proven to be an amazing garden specimen, thriving for years, despite our heat and humidity. Did I mention it flowers from spring through summer?
Our clump of the native, Sabatia kennedyana just finished another amazing floral show. This fabulous, but easy-to-grow perennial has a truly odd native distribution on the coastal border of North and South Carolina, on the coastal border of Massachusetts and Rhode Island, and in Nova Scotia! I don’t think I’ve ever seen such an odd, disjunct range. Sabatia kennedyana is best suited for a sunny, slightly acidic bog, but regular garden soil will work fine, if it’s kept moist. I have no idea why this isn’t grown in every garden that has the correct conditions. Winter Hardiness is Zone 6-8, at least.
Little Big Man
Most highly prized rock garden plants originated somewhere other than the Southeast US. One notable exception is Bigelowia nuttallii, or if you prefer common names, Nuttall’s rayless goldenrod. This fascinating plant resembles a whisk broom that just swept up a spilled bottle of mustard.
Named after English botanist/zoologist Thomas Nuttall (1786-1859), who lived in the US from 1808 until 1841, this fascinating plant, grown by rock gardeners worldwide, is native in only a few locations from Georgia west to Texas.
Bigelowii nuttallii makes a tight evergreen clump of needle-thin leaves, topped from mid-summer until fall with 1′ tall sprays of frothy yellow flowers…yes, those are actually flowers, but without the typical showy “rays”. Full sun for at least half a day, and good drainage are the key to success with this very easy native perennial. Hardiness is Zone 5a-9b.
Redneck Baby’s Breath
Tired of trying to grow the conventional baby’s breath, that’s a prize perennial in the colder zones? We were, and had been looking for a substitute for years, when in 2000, one of our former staffers introduced us to the widespread native, Euphorbia corollata. Although it doesn’t look like much in deep shade where it’s often found in the wild, it explodes when given a bit of sun. Here are a couple of photos as it’s flowering season starts in mid-July.
Euphorbia corollata looks seriously gangly in a pot, so we’re confident you’ll never see this on the shelves of the box stores. Average moisture to very dry suites it fine. Although not a clumper, it’s spread it’s far from a thug, and is easy to remove it it happens to move too far. For a plant that’s native to every state East of the Mississippi (except Florida), and almost every single county, it’s shocking that every gardener isn’t growing this gem. Hardiness is Zone 3a-9b.
A Golden Native
Here’s a photo this week of one of our favorite North American native plants, Juniperus horizontalis ‘Copper Harbor’. This would certainly add significant year round color interest to any native plant garden. In our trials, this is far and away the best of the golden Juniperus horizontalis cultivars. We offered this selection for a couple of years, but there seemed to be little interest.
It’s a Good Year – A
We recently ran across this clump of the summer-flowering native (Canada south to Florida) orchid, Goodyera pubescens growing in a site near JLBG. Like a century plant, the flowering rosette dies after flowering, but new side shoots are produced for future generations. Work is being done to produce this in tissue culture so it can be made more widely available from nursery propagated stock. Sadly, most plants sold today are wild collected.
Of the 100 species of Goodyera orchid, only 4 are US natives.
Humility in the Garden
This spring, Plant Delights introduced Zac Hill’s 2013 discovery of a new ruellia which he found in central Alabama. What we theorized might be a natural hybrid turned out to be a brand new species, as we were informed by botanists working on getting the plant published. We hope all native plant enthusiasts purchased this to both enjoy in their garden and for ex-situ (off site) conservation value. These are in full flower during the summer. Hardiness is unknown at this point, but we know it’s fine from Zone 7b – 8b, and most likely much further north.
We ran across this fascinating reticulated leaf form of the US native (every state east of the Mississippi) groundcover partridge berry (Mitchella repens) last week, when tromping through the woods near JLBG. We’ve taken a few cuttings that will be evaluated here for garden performance. In 60 years of botanizing, this is the first form we’ve seen with this nicely patterned foliage.
Eau de Chocolate
One of the most amazing summer perennials we grow is the native Berlandiera pumila ‘Chocoholic’. It is unfathomable to us, why this isn’t grown in every full sun garden where it’s winter hardy. The flowers, which smell like milk chocolate, top the 3′ tall clump nonstop from May until October. In the wild, Berlandiera pumila can be found from NC south to Texas, so its drought tolerance is excellent. We rate this as Zone 7a to 9b, but that’s only because we don’t have feedback from folks in colder zones yet. Please let us know is you have this survive temperatures lower than 0 degrees F without snow cover!
Curvy Mountain Mint
Gardeners interesting in attracting pollinators to the garden have no doubt experimented with one of the 20 native species of Pycnanthemum (mountain mint). While they are all lovely, most are too vigorously spreading to fit in a typical home garden. Enter Pycnanthemum flexuosum…the curvy mountain mint, is native from Virginia to Alabama, where it is found on moist to damp sites. This tightly clumping species is absolutely perfect for the garden, flowering now in July. This is our collection from Beaufort County, NC. We’ll be propagating this selection for a future PDN catalog. Hardiness is Zone 5-9a.
Another of our favorite early summer plants is the amazing southeast US native Dichromena colorata (aka: Rhynchospora colorata). Known by the common name, white-top star grass/sedge, this tough-as-nails groundcover can be found inhabiting moist ditches from NC to Texas. The floral show last for 1-2 months, depending on weather. Here, we have it growing in regular garden soil (sandy loam) amended with compost, and irrigated regularly. White-top sedge does spread, but not aggressively. Regardless, we’d recommend keeping away from nearby wimpy growers, which would be quickly consumed. Hardiness is Zone 7a and warmer.
Thyme Flies, Thymophylla Flowers
We are in love with the long-flowering Thymnophylla pentachaeta var. pentachaeta ‘Laredo Gold’, which graces us with masses of gold flowers from spring through fall, in our sunny, dry rock garden. This Patrick McMillan collection comes from a population in Texas. Not only is this short-lived, southwestern US native reseeding perennial great in flower, but the native Navajo Indians also used it as a drug for people who want to dream of being chased by deer….we are not making this up!