For several years, we’ve been fascinated with the genus, Hemiboea, a collection of 23 species of African Violet relatives, all native to China. We currently grow five of those, and two others that are still to be identified. On a 2020 trip to England, we picked up Hemiboea strigosa, which has been flowering beautifully here at JLBG, starting in early fall. The Latin word “strigosa” means stringy, which certainly describe the mat of stolons which lie right at the soil surface. So far, our plants have been through two winters, where they fared very well. If the good performance continues, we will start propagation soon.
Season’s Greetings from all of us at Plant Delights and Juniper Level Botanic Garden. With the National Day of Giving on November 29, we thought we’d wade into the fray and make our case for a donation to our future operational endowment for JLBG.
As you are probably aware, we are in the process of transitioning to our next phase of existence. Age and health issues catch up to all of us, and while our health is still fine today, we needed to put a plan in place to ensure the future of the gardens at JLBG.
Several years ago, we (Anita and I) gifted the entire property, which includes both Plant Delights Nursery and Juniper Level Botanic Garden to NC State University for safe keeping, to which they have gladly agreed. The only thing remaining is to fund the yearly operational expenses of the gardens, since the University has no funds to do so. The University has established an operational endowment, for which we are currently raising funds.
To maintain the garden at its current level of operation will require a $17 million dollar endowment. To date, we have raised $600,000. As you see, we have a long way to go, and with us continuing to age, the urgency to fill the endowment increases every day. We hope you’ll be willing to contribute to our year end appeal if you think the gardens are worth preserving. Please also help us to share the word with your gardening friends…especially those who have won the lottery and need a good tax deduction.
If you haven’t visited JLBG in a while, we have included some 2022 garden shots.
Here is the link to find out more about the endowment, our future plans, and to make a year end donation. If you’d like to chat with us further with questions or thoughts, please email us at firstname.lastname@example.org.
-tony and anita
Begonia U-521 is a species we got from a customer in Alabama, which has sailed through our winters at JLBG since 2017. Flowering begins for us in early fall, with clusters of large pure white flowers, which hide just below the leaves. For those unfamiliar with Begonia U-numbers, these are assigned by he American Begonia Society for plants new to cultivation that represent potential new species.
This amazing begonia was purchased by begoniaphiles Charles Jaros and Maxine Zinman from the Bangkok Market in Thailand. For those who haven’t visited this amazing marketplace, it’s a massive venue where local vendors (nurserymen and collectors) sell their wares.
It turns out that this species came from the wild via a collector who lives on the border of Thailand and Cambodia, where no plants should be winter hardy here in Zone 7b. We’re not aware of anyone currently working on naming new begonias from that region, so to offer it, we’ll need to assign a cultivar name, which will remain connected to the plant, once it becomes a published species.
Nurses and plant taxonomists are among the few fields in which you would run into the term, anastomosing veins. Having been in the plant world all my life, I had never even run into the term until trying to key our some bamboo ferns in the genus, Coniogramme, almost a decade ago. It turns out that to distinguish between species, you need to determine if the spore patterns on the back of the leaf have an anastomosing or parallel vein pattern. Anastomosing veins are those which diverge and reconnect forming a pattern like a snake skin. We’ve grown quite a few ferns, but none have the amazing vein patterns of coniogramme. Below are the leaf backs of Coniogramme japonica in fall.
Looking wonderful in the fall garden is the evergreen Choisya ‘Limo’, known commercially as Goldfingers choisya. This gold-leaved selection is from a cross of two Southwest US native shrubs, Choisya arizonica and Choisya ternata, subsequently referred to as Choisya x dewitteana. The genus Choisya is named to honor the late Swiss botanist/philosophy professor Jacques Denis Choisy (1799-1859) This gold-foliaged selection from the UK’s Peter Moore forms a 3′ tall shrub in 5 years.
The fragrant white clusters of axillary flowers adorn the plant starting in April (NC). We have our specimen planted in a full sun rock garden, where it thrives in very well-drained soils. Hardiness is Zone 6a-9b.
Have you ever been seated by someone who exercised no self control when it came to their application of perfume to the point that they left you gasping for fresh air? Well, there’s a shrub with the same degree of insanely sweet scented flowers, Osmanthus heterophyllus ‘Kaori Hime’.
This fascinating Japanese selection of the Japanese/Korean/Taiwanese native shrub is renown for its tiny foliage as well as the multitude of tiny white flowers with an over-the-top perfume sweet fragrance. Our plant has been flowering for nearly a month…an incredible treat for the fall garden. Our 10 year-old specimens measure 7′ tall x 12′ wide…much larger than most on-line vendors indicate.
We love the winter hardy Chinese schefflera, Schefflera delavayi. This smaller and hardier version of the small tree that’s planted throughout central and southern Florida, is reliable for us here in Zone 7b. Here’s an image taken just prior to our first hard freeze. It’s been a few years since we got viable seed, so fingers crossed for this year.
A couple of years ago, we made bi-generic crosses of the North American Manfreda maculosa and the naturally occurring hybrid Mexican tuberose, Polianthes x bundrantii ‘Mexican Firecracker’. These fascinating plants were still in full flower prior to our first hard freeze in the last few days. These are images of our top three clones, which we refer to as x Polifreda. Because we used the non-fragrant tuberose species, there is no noticeable aroma, but we opted for a much more diverse flower color range instead.
Hopefully, next year, we can use these to cross with agaves to create a new series of xHanseras. Pollen has been gathered and stored in the refrigerator in case bloom times don’t coincide next year.
Most folks have grown butterfly bushes in the genus buddleia, yet few garden visitors recognize this fascinating species from our 1994 botanizing trip to Northern Mexico. I should add that most buddleias on the market are developed from the Asian species, and virtually none from the less colorful North American species.
Buddleia cordata ssp. tomentella grows in rocky, bone-dry hillsides in the mountains of Northern Mexico near the town of Los Lirios at 7,000′ elevation. I was only able to find a single seed, but fortunately, it sprouted, and 28 years later, this amazing specimen is the result.
One of the cool things about Buddleia cordata ssp. tomentella is the insanely fragrant flowers, which start for us in early fall, and continue all winter…a trait you won’t find in any other temperate shrub of which we’re aware. As you can imagine, it is awash with an array of pollinator insects The flower color is a dusty white, so this will never be a plant that will make it to the shelves of your favorite box store. That said, it’s a plant we wouldn’t be without in our garden.
One of my most lustful plants has been the super cute Euphorbia clavarioides var. truncata. I first ran into this fascinating poinsettia cousin at the Denver Botanic Gardens in the 1990s, and have subsequently killed it 5 times, prior to the construction of our crevice garden. Now, our specimen below is 2.5 years old and thriving. The key is perfect drainage and no water in the winter.
Below is a giant clump, which we saw in the wilds of South Africa in 2005. These massive clumps are considered to be well over a century in age, so our little patch has a lot of growing to do.
Flowering now in the garden is the fabulous Fatsia japonica ‘Ripple Effect’. Although this isn’t currently on the market, we’re working diligently on propagation. Thanks to the US National Arboretum for sharing this amazing selection, which we hope to introduce in the next couple of years.
Here’s a garden shot just prior to our expected first freeze of the year. Foreground to back: Muhlenbergia lindheimeri, Salvia darcyi, Juniperus conferta ‘All Gold’, Cuphea micropetala, Salvia ‘Phyllis Fancy’.
Elliott’s aster (Symphyotrichum elliottii) is the absolute last of our asters to flower at JLBG. It doesn’t begin to flower until the first of November and withstands the mild frosts of October like they didn’t even happen. It is naturally found in tidal freshwater marshes and other moist open sites from the Virginia and Carolina coastal plain south to Florida and west to Louisiana. Though it hails from moist environments it thrives under general garden conditions if the soil isn’t allowed to become too droughty.
The plant has a lot to recommend it besides the time of flower. It forms stiff stems rising 5-6’ tall crowned with a dense pyramidal arrangement of inflorescences of pale pink with a hint bluish-purple ray flowers and bright yellow disk flowers. The lack of lanky branches allows this tall aster to display its flowers without flopping all over the rest of your garden in the manner typical of asters. It spreads via rhizomes, so you need to be sure to give it space to roam a bit. It provides a dramatic impact when planted at the back of borders. Though it spreads, it doesn’t roam far from the parent plant and can be easily kept in place by yearly thinning of the outer edges of the clumps.
The most outstanding feature of this beautiful aster to me is the number and diversity of pollinators it supports. I don’t think I’ve ever seen a plant that attracted more. In addition to swarms of honeybees, bumblebees, carpenter, and solitary bees the flowers draw in numerous pollinating flies, halictids, moths and skippers. I love plants that extend the color season and though we all think about early spring, we really should also plant to extend our love affair with color into the leafless season and Elliott’s aster does this is a big way.
Raise your hand if you grow the native October Flower? Polygonella polygama is a little-known, but absolutely amazing wildflower in the Buckwheat family, suited to well-drained, sunny gardens. Although completely non-descript through spring and summer, when people are buying plants, it bursts into flower in October, also when no one is buying plants. Below is our plant strutting it stuff in one of our full sun rock gardens in mid October. Polygonella polygama is native from Virginia southwest to Texas, along the coast. Winter hardiness should be at least Zone 7b and south.
Considered the hardiest of the genus Brahea, this rare endemic palm hails from the alkaline Sierra Madre Oriental Mountains in northeastern Mexico, where it’s endangered thanks to the abundance of hungry goats.
Brahea decumbens is ridiculously slow growing. Eventually, the immature green leaves turn a beautiful silvery grey and adorn the 6′ tall x 10′ wide specimen that, with age, develops creeping (decumbent) trunks…much like a blue-leaf Serenoa repens.
We’ve failed three times, loosing each in the winter. Zac mentioned that these need an extremely abusive and neglected environment to survive, so we planted our fourth attempt in our gravel crevice garden where it receives no irrigation. After 3.5 years, it’s actually thriving and looking particularly nice this fall.
With enough plant diversity, there are all kind of possibilities to target floral interest for certain seasons or even holidays. Since the Halloween season is just past, here are a couple of seasonal favorites.
If there’s ever been a plant designed for the Halloween holidays, Cuphea micropetala has to be near the top of the list. This amazing perennial hails from the subtropical regions of Central and Southwestern Mexico. Below is our plant on Halloween this year. Flowering for us typically starts in early October. Despite its warm origins, it’s a reliable perennial here in Zone 7b.
The other can’t miss seasonal favorite, is our 2005 introduction of Gladiolus ‘Halloweenie’. This crazy gladiolus from South Africa, skips the typical spring flowering season, and instead, starts flowering the week of Halloween.
We are always interested in checking out the offspring, when plants in the garden have unexpected romantic rendezvous with their distant cousins…often when we least expect it. We have found arums tend to be quite promiscuous in the garden. While most offspring go to the great compost pile in the sky, a few are worthy of adoption and naming.
Below is our selection of a cross of Arum dioscorides x Arum italicum that we named Arum ‘Love Child’. While the foliage resembles typical Arum italicum, the spring-borne flowers show great influence of Arum dioscorides with the purple spotting inside the spathe. It’s our hope that Plant Delights will have a first crop of this new hybrid to share in the 2023 catalog.
Flowering today at JLBG is one of the tiniest of the geophyte aroids, Ambrosina bassii. This tiny gem, which matures at a whopping 1-2″ in height, is native to the Mediterranean region from Southern Italy to Northern Africa, where it grows on woodland slopes over alkaline rocks. There is only a single species in this little-known genus.
This week, we fielded a call from our garden staff that there were large yellow jacket (Vespula maculifrons) nests in several arborvitae near where they were working. Knowing how aggressive and toxic the stings of these native vespid wasps can be for humans, they had requested help in getting the nests eliminated.
When Patrick arrived to check out the problem, he noticed that instead of finding nests, the yellow jackets were actually feeding on the arborvitae. Since this species of arborvitae was currently in the midst of pollen and cone production, there also appears to be some type of resin being exuded at the same time, which is a delicacy for the yellow jackets.
We estimate there were between 100 and 200 yellow jackets per plant. Because they were busy feeding, they had no interest in us, despite our close up study of their behavior. Our entomologist, Bill Reynolds, who had observed this phenomenon before with vespid wasps and arborvitae, showed us that we could actually touch the yellow jackets without drawing their ire. This is certainly not the case if you’ve ever been anywhere near a yellow jacket nesting site.
The other interesting phenomenon is that despite being Eastern US natives, the yellow jackets were only interested in the Asian arborvitae species, Platycladus (Thuja) orientalis. Growing adjacent was the East Coast and West Coast arborvitae, Thuja occidentalis and Thuja plicata, but neither attracted a single insect. This is another nail in the coffin of that oft repeated myth that only native plants feed native pollinators. One of many lessons here, but it’s especially important not to spray first and ask questions later.
History is replete with examples of new plant species that are first encountered by intrepid plant explorers, yet described later by taxonomists. Salvia darcyi was discovered and introduced into cultivation by Carl Schoenfeld and John Fairey of Yucca Do Nursery. Three years later, they guided researchers to the site who subsequently described the species without acknowledging the original collector. It is unfortunate that the act of discovery by those in horticultural circles are so seldomly recognized (not to mention the indigenous peoples who have known many of them for eons).
Upon my first visit to Heronswood in the autumn of 2019 I was shown a splendid robust Begonia with heavily lobed leaves, short upright stems, and amazing tight-clumping habit with yellow (yes yellow!) flowers. I immediately confirmed that this was a heretofore undescribed species. The plants had been grown from the seed collection made by Dan Hinkley along with fellow collectors and nurseryman, Shayne Chandler and Leonard Foltz, from Arunachal Pradesh India. These plants were shared by Mr. Hinkley with Monrovia who immediately released it under the name TectonicTM Eruption Begonia (Begonia sp. DJH18072).
The unknown Begonia has now been given a formal scientific name Begonia lorentzonii by Swedish taxonomist Eric Wahsteen and the Indian researcher Dipankar Borah, based on two specimens collected by Borah in November of 2018 (incidentally, after Dan Hinkley’s collection). No mention of the plant in cultivation or the contribution of Dan is found in the publication despite the fact that quite a few of the Begonia aficionado crowd around the globe had by then become familiar with the plant. Regardless of the name, this species is among the most spectacular hardy garden plants for cool but not cold climates.
Begonia lorentzonii has proven hardy at Heronswood (zone 8a) where it was left outside with only a covering of leaves and straw in temperatures ranging into the low teens and at least a week long stretch of consistently below freezing temperatures which resulted in ground freeze. It forms 2-2.5’ tall dense clumps with one of the best forms I’ve seen in a cold hardy species.
In late summer through late autumn it is adorned with yellow flowers beset with hairlike projections on the outer surface of the tepals produced on stems that equal or are slightly shorter than the leaves. Begonia lovers should visit the Renaissance Garden at Heronswood to see mature plants in their full glory and a pilgrimage to Heronswood is a must for all hardy Begonia lovers as the collection of rare and unusual cold hardy species is probably the best among our public gardens. While this startling plant appears to be perfectly adapted to life in the mild Pacific Northwest it remains to be seen what its tolerance for heat will be. It was an honor and pleasure to grow and nurture these plants during my time at Heronswood and I must admit my heart and mind will forever be drawn to that sacred space of ground whenever I glimpse a Begonia of any species.
Dr. Patrick McMillan
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.
I wish I could count how many times we’ve been told, “That won’t grow in your climate.”. Our contrarian streak has led us down many interesting paths, with quite a number of surprising results.
The most recent is Chrysophyllum oliviforme. Over a year ago, we planted seed grown plants, native to the recently hurricane-ravaged Sanibel Island, Florida. This species is native to Southern Florida, the Bahamas, the Greater Antilles, and Belize. With that distribution, it should have no chance in our winters, but, despite die back during last winter’s low of 16F, it returned, and is now approaching 4′ in height. I should add that our plant was planted on a very exposed site, with no protection.
Is it going to be a long-term plant….probably not, but there is obviously more winter hardiness than most informational sites would lead us to believe. I should add that we planted two seedling, and the other one planted nearby, succumbed to the winter temperatures. If you never take risks, you’ll rarely get to experience the joy of amazing surprises like these.
The amazing Chinese native Pronephrium penangianum ‘Jurassic Park’ is looking fabulous in the garden this week. This large growing, spreading fern has the feeling of a plant from the time when dinosaurs roamed. We continue to make cool, but little-known ferns like this available to a wider audience. Hardiness is Zone 7b-9a at least.
Last week, we were repotting our container agaves prior to winter, when we ran up on this unusual sight. Let me begin by explaining that there are three groups of agaves, based on how they propagate: solitary agaves, rhizomatous agaves, and offsetting agaves. While it’s not unusual for a rhizomatous agave to produce an underground shoot in container, this level of underground shoots is highly unusual. What is even stranger is that this is a non-rhizomatous cultivar.
Since some agaves are poor or non-offsetters, the only way to force them to multiply is to remove the apical bud, either by means of coring, or drilling. Once this is done, the agave usually forms offsets in the remaining leaf axils. For some reason, when this plant of Agave ‘Ripple Effect’ was cored, it went nuts by developing underground rhizomes.
Left to its own devices, there will be one plant produced from the growing tip of each rhizome. There is, however, a dormant bud every few inches along the rhizome, so in theory, this could produce hundreds of plants if we can figure out how to make the dormant buds break. Below are the shoots after we unwound the twisty rhizomes.
As fall temperatures drop, it’s not unusual to find our native bees asleep in some of the most interesting places. We caught this carpenter bee fast asleep on the job this week, clinging tightly to the spines of an Agave parryi.
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.
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.
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.
You’re probably thinking that we’re referring to a branch of the military, but instead we’re writing about a plant by the same name. x Amarine is a man-made amaryllid hybrid, created from a bi-generic (think humans x gorillas) cross between Amaryllis belladonna and Nerine. As a rule, most Amaryllis belladonna are fairly ungrowable in the Southeast US, as are most nerines. In theory, the hybrids should be completely ungrowable, but fortunately, that isn’t the case.
Amaryllis belladona is difficult for us to flower because the foliage, which grows during the winter, gets blasted by cold weather, which in turn prevents it from sending energy to the bulb, resulting in a lack of flowers. The same holds true with the hybrid x amarine. It’s only after a mild winter or two that the bulbs have enough energy to produce flowers. Thank goodness, this is a great year for x amarines to flower. Below are one of our patches of x Amarine ‘Anastasia’, which has been flowering at JLBG for several weeks.
One of our most amazing dwarf ferns is our 2008 Taiwanese spore collection of Microsorum brachylepis ‘Datun’. Our garden patch pictured below, which is looking great this month, was planted outdoors in 2017, and is now 4″ tall x 3′ wide. We offered this personal favorite a few years through Plant Delights, but the sales were rather miserable…what a shame. This delightful evergreen makes a superb, dense groundcover. Hardiness is Zone 7b-10b.
Raise your hand if you grow Debregeasia orientalis? This fascinating plant, which looks great now at JLBG in late October is an Adam Black, collection of a male form from Taiwan that we named Debregeasia orientalis ‘Hot Tai-male’. While we realize the mature 7′ tall x 14′ wide size of debregeasia is a bit large for smaller gardens, it’s an amazing Cousin It-shaped specimen where you have enough space. It belongs to the weedy nettle family, Urticaceae, which is why it isn’t more widely known….guilt by association. Our plant has performed wonderfully since 2014. Hardiness is Zone 7b-10b.
Our 2016 century plant hybrid is looking quite lovely in the garden this month. This plant, which we named Agave x victorifolia ‘Prince of Whales’, is a hybrid of the Whale’s tongue century plant, Agave ovatifolia (male parent), and the Queen Victoria century plant, Agave victoriae-reginae (female parent).
Since both parents are non-offsetting, this means that the offspring will grow to maturity, flower, then die. Consequently, in order to be able to propagate and share, we will have to drill out the central core of the plant to trick in to offset. While this ruins the appearance of the original, it’s the only way for this to ever be shared and preserved. This plant has been in the ground since 2018, so we expect to have another eight years (guessing) prior to flowering. Consequently, so we’ll probably gamble on waiting a few more years before performing surgery. Winter hardiness is Zone 7b-10b.
Below is a photo of both parents.
We love the various shades of green displayed by the fascinating Fatsia japonica ‘Murakumo Nishiki’. This amazing Japanese selection of tree ivy is looking rather stunning in the garden this month. This is a slow-growing shrub, which should mature at 4′ tall x 6′ wide. There is a shortage of these in commerce currently, because of a problem with tissue culture lab production. Winter hardiness is Zone 7b-10b.
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.
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.
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.
If you think you know mahonias, then check out this little-known species, flowering now at JLBG. Mahonia nitens is endemic to Guizhou and Sichuan, China. This is a form selected by Japanese plant explorer, Mikinori Ogisu. For us, the plant matures our at 4′ tall x 5′ wide, with flowers that appear orange, due to the color of the flower buds. Hardiness is unknown north of Zone 7b.
Looking lovely in the garden today is the fall-flowering geophyte, Sternbergia sicula. This Mediterranean native is found in the wild growing on alkaline hilly sites. Some taxonomists list it as a subspecies of the more common Sternbergia lutea, but it seems consistently smaller. At JLBG, our plant thrives in the crevice garden. Hardiness is Zone 6a-8b.
Looking good in the garden now is Begonia taiwaniana ‘Alishan Angel’, which is our 2008 collection from 6,500′ elevation in Taiwan’s Yushan Province. This specimen has now been in the ground since 2010, and is thriving in a fairly dry woodland location. We introduced this selection in 2020 and will be offering it again in 2023. Hardiness is Zone 7b-9b at least.
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.
Most folks are familiar with the mysterious Howard Hughes, but we have an equally mysterious “Howard” in horticulture. Flowering well now in the gardens at JLBG is the amazing xHowardara ‘Riley Kate’. This fascinating hybrid was created by Texas bulb guru, Dr. Dave Lehmiller, who crossed a Hippeastrum (amaryllis) and a Sprekelia (Aztec lily), and a Zephyranthes (rain lily). Lehmiller’s cross resulted in five different named cultivars and were subsequently named after the late Texas bulb guru, Dr. Thad Howard.
Creating a trigeneric hybrid is beyond rare, since it isn’t supposed to happen according to the rules of botany. Consequently, the introduction of the first clone sent taxonomists into a frenzy trying to publish new research to re-combine the genera involved into a single genus, so as not to have their rules violated. xHowardara’s occasionally flower for us in mid-summer, but peak flowering is always in September and October in our climate. Hardiness is Zone 7b – 9b, at least.
Our planting of Glandulicactus wrightii is looking quite lovely as we head into fall. Sadly, few folks take time to closely examine the fascinating and intricate arrangements of cactus spines. Glandulicactus wrightii, which is native to Texas and adjacent Mexico has amazingly long, hooked spines that resemble cat whiskers. Long term winter hardiness is hopeful here in Zone 7b, since the seed from which this was grown came from a population at 5,000′ elevation on the New Mexico/Texas border.
We’ve had Salvia ‘Rockin’ Deep Purple’ on trial since 2018, and it’s now headed for our January Plant Delights catalog. Although we love the Argentinian Salvia guaranitica, it spreads far too fast to be useful in many of our garden beds. We have been trialing a number of hybrids with Salvia guaranitica and an array of different clumping species to find one that has winter hardiness, but doesn’t take over the garden.
Salvia ‘Rockin’ Deep Purple’ from California’s Brent Barnes, has lived up to all of our expectations, as long as you have enough space. For us, a single clump measures 5′ tall x 10′ wide…a far cry from the 3.5′ tall x 2.5′ wide size that’s often marketed on-line. Below is an image of the flower power it’s still showing in early October. The bumblebees love it as much as we do.
The false yew, Cephalotaxus harringtonia ‘Gold Dragon’ is looking particularly lovely during the fall season here at JLBG. This is one of our six year old specimens. We find that half day sun seems to bring out the best color without foliar burn. Hardiness is Zone 6a-9b.
One of our favorite hardy garden ferns are the amazing cat’s claw ferns of the genus Onychium. The genus comprises between 9 and 23 species, depending on your choice of taxonomist.
The most common species in cultivation is the Japanese Cat’s claw fern, Onychium japonicum, which we’ve had the pleasure of offering many times through the year. Now, we’re working on getting another species into production, Onychium contiguum. Compared to Onychium japonicum, Onychium contiguum is much smaller and slower-growing with even finer cutleaf foliage. We picked up this Elizabeth Strangman wild collection during a 1994 trip to England’s former Washfield Nursery. Below is our original clump in the garden this week.
Ajuga ‘Parrot Paradise’ is one of many new next generation colorful ajuga groundcovers that have hit the market in the last few years. These have been amazing in our trials, as you can see from the October photo below. Best of all, we haven’t seen any seedlings, which have been a problem with several of the more common clones in commerce. We think both the color and growth habits are truly outstanding.
Just like the rock group of the same name, these fascinating living stones also look quite old and wrinkled. The genus Lithops are tiny succulent plants native to the deserts of South Africa. Despite virtually all references on-line, they make great garden plants…as long as you have a crevice garden, and grow them when they will not receive any rain in the winter months. These are 4 1/2 years old from seed.
Our plants of Lithops aucampiae have just started their flowering season last week, having sailed through winter temperatures of 16 F last winter, and seemingly enjoyed our hot, humid summers. We’re hoping for single digits F this winter, so we can really put them to the hardiness test. In the meantime, we’ll enjoy the fall flowering season.
Chamaecyparis ‘Red Velvet’ is a juvenile-leaved selection of our native white cedar, Chamaecyparis thyoides, discovered and introduced by Florida’s Blue River Nursery. This recent introduction looks similar to the 1960s introduction, Chamaecyparis ‘Rubicon’, except that ‘Rubicon’ dies in the garden on a bad day, and on a good day looks like death would help it. Chamaecyparis ‘Red Velvet’, on the other hand, is a superb garden plant.
So, why is this the case? Well, there are two distinct forms of this US coastal native wetland species, Chamaecyparis thyoides. Some botanists recognize the southern ecotypes as a separate species, while other make no distinction. We agree with those who recognize the southern plants as a subspecies,.Chamaecyparis thyoides ssp. henryae, which has a natural distribution centered in the Florida panhandle, and is dramatically easier to grow in the garden. Chamaecyparis thyoides ssp. thyoides, which ranges from Maine to Georgia, is much more difficult to grow in most garden conditions.
Because white cedar is native to cool fresh-water wetlands, very few cultivars perform fine in average to moist garden soils, while others fail miserably. What we need are more selections of the better adaptable Chamaecyparis thyoides ssp. henryae. The only named cultivars we know to exist is Chamaecyparis ‘Webb Gold’, and the afformentioned Chamaecyparis ‘Red Velvet’.
The cultivar ‘Red Velvet’ matures at 12-15′ in height. Our four year old plants have reached 6′ in height. In winter, the foliage color changes from green to a reddish purple, hence the name. Thanks to Georgia conifer guru, Tom Cox for spreading this amazing selection around to collectors and nurseries. Estimated winter hardiness is Zone 7a-9b, and probably much colder.
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.
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.
We love the genus Hydrangea, but are really fascinated by those at the far end of the family tree. While most hydrangeas flower in late spring, we actually have a couple flowering now we’d like to share.
The first is Hydrangea involucrata, a native to both Japan and Taiwan. The word “involucrata” indicates it has some serious involucres (the bracts surrounding the inflorescence). The first image shows the plant in bud, the second in full flower, and the third image is after the flower color has faded. All three stages are on display at once in the garden this week. They typically reach 6′ in height and width. Winter hardiness is Zone 6a-8b.
Hydrangea amamiohshimensis (below), from Japan’s southern Ryuku Islands, was once considered a hydrangea cousin, until a 23andMe test confirmed it was actually a true hydrangea. Prior to the test, it belonged to the genus Cardiandra, which was effectively a perennial hydrangea, dying back to the ground each fall like most perennials. It too is in full flower in the woodland garden this week. Perhaps now that it has a recognizable name, more folks will be willing to grow it. This is the only one of the four former cardiandra species that has survived in our climate.
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.
We have a fairly decent collection of conifers at JLBG, but one that has really caught our eye is Chamaecyparis pisifera ‘Baby Blue Ice’. This charming dwarf was found in 1998 by Oregon nurseryman Larry Stanley as a sport of Chamaecyparis pisifera ‘Baby Blue’. Our oldest plants are now four years old and are 3′ tall x 2′ wide. The naturally dense growth and conical shape give the impression that it’s been sheared, which is not the case.
Word on the street is that it should mature around 6′ tall, but with newly discovered plants like these, we take those size predictions with a large grain of salt. Undoubtedly, mature size in the Southeast US will be quite different than in the heat-deprived Pacific Northwest.
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.
Looking particularly lovely in the garden is the elegant fern, Dryopteris affinis ssp. affinis. The semi-evergreen golden-scaled male fern from Europe is among the easiest and most beautiful ferns we grow, yet when we offer it through the nursery, it’s always one of the worst sellers. We struggle to figure out mysteries like this when you have a fern that grows equally as well in acid or alkaline soils, and grows the same in the Pacific Northwest as it does the hot, humid Southeast US. Winter hardiness is Zone 4a-8b.
Looking good in the garden now is Callicarpa americana ‘Welch’s Pink’, discovered by former PDN’er Matt Welch in East Texas. This is pink fruited form of our native American beautyberry, Callicarpa americana. The fruit are an important fall food source for many species of birds.
In our hot, humid climate, we really struggle with keeping most cultivars of Caryopteris x clandonensis alive for very long. A lovely exception in our trials has been Caryopteris ‘Gold Crest’, a recent introduction from the plant breeders at Ball Hort. Here is our three year old clump in the garden this week. The foliage is deliciously fragrant…more so than any other caryopteris we’ve ever grown, and the native bees find it incredibly attractive. We’ll be adding this to the new Plant Delights catalog in January. Winter hardiness is Zone 6a-9b.
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.
It’s not unusual for ferns to have sex in the wild, even with other species in the same genus. It is, however, unusual for them to have meaningful sex with ferns of an entirely different genus. Such an odd occurrence recently happened in the greenhouses of Louisiana’s James Georgusis.
One night, possibly after a wild Mardi Gras party, a willing Phlebodium got it on with a crested tongue fern of the genus Pyrrosia. The result was a new genus of fern, x Phlebosia. It was adopted and given the cultivar name, ‘Nicolas Diamond’. At least the parents had the good sense to sexually stay within the same family, Polypodiaceae
We planted our first specimens in the garden this February, and so far, it’s growing well. The key will be to see how much winter hardiness it has…fingers crossed. Both parents are pictured below the new hybrid.
Looking fabulous in the garden now is the perennial Salvia ‘Big Blue’. This amazing sage has been in flower since spring, and has yet to slow down. It’s also a favorite of the native bumblebees.
We love fall not just because of the weather, the colorful foliage, the fall bloomers, but also for the fall fungus. It seems like some of the most incredible fungus of the year happens in fall. When we go outside to take plant photos, it’s hard to resist the amazing fungi as well. Like sand castles at the beach, fungi are quite ephemeral, so our only memories are through captured images. Here are few shots from the last week.
In flower this week is the amazing ginger lily, Hedychium ‘Flaming Torch’…our 1999 introduction, with its’ fragrant peachy flowers is still looking great! This is another of those plants that never sold particularly well, so we haven’t offered it since 2016. Winter hardiness is Zone 7b and warmer.
With the trend for green mulch (i.e. groundcovers), we continue to trial a number of new introductions that fit the bill. One of the top performers continues to be Sedum ellacombeanum ‘Cutting Edge’ PP 28,926. This 2016 Brent Horvath introduction has thrived in both sun and light shade, making a perfect ground-hugging mat. Despite being a top performer, sales were miserable when we offered it a few years ago. We’re not sure why it sold so poorly, but we now have some lovely drifts in the garden.
Flowering this week at JLBG is the amazing Miscanthus transmorrisonensis. Many gardeners, who blindly believe everything they read/hear think the genus miscanthus is the horticultural version of the devil itself. Like everything in life, it’s all about those pesky details, which so many people simply don’t want to be bothered with.
Most miscanthus in the horticultural trade are selections of the species Miscanthus sinensis. Some selections of that species reseed badly and should be avoided in gardens. Others are sterile or nearly so, and unquestionably still deserve a place in American landscapes.
If we make good/bad evaluations at the species level, what would happen if visitors to the earth had their first encounter with a Homo sapiens that was a less than ideal representative of the species at large. They could easily assume that the entire species was a problem and should be eliminated. It’s fascinating that such species based prejudices are acceptable with ornamental plants, but not with people.
Then there are species, which have proven themselves to be complete without seed in our climate, such as Miscanthus transmorrisonensis. All plants in cultivation all appear to be derived from a 1979 Ferris Miller (Chollipo Arboretum)/ Paul Meyer (Morris Arboretum) collection at 9,500′ elevation on Taiwan’s Mt. Daxue. We have grown this for 30 years in rather good conditions, and have yet to see a single seedling. The beauty of this species is that it flowers continuously from summer into fall. I guess it’s too much to ask for environmental fundamentalists to actually pay attention to facts.