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.
We thought we’d share a photo taken this week of the original plant of Illicium parviflorum ‘Florida Sunshine’ from our garden. All plants sold worldwide originated with cuttings taken from our specimen. The original plant has now been in the ground here for 22 years and measures 8′ tall x 8′ wide. The foliage becomes brightest in the cool temperatures of winter. Who says Southeast US native plants look ugly? Hardiness zones 6a to 9b.
Agave ‘Crazy Horse’ is an amazing agave hybrid we purchased back in 2005 from an Ebay seller in Texas. The vendor had found the plant growing at a real estate office in Montgomery County, Texas. It’s obviously a hybrid, but we still don’t know the parentage for sure. If we had to guess, it appears to be a hybrid of Agave x protamericana and Agave cupreata. In the 18 years, we’ve grown it, it’s been an exceptional plant, forming 3.5′ tall x 5′ wide rosettes, and suckering tightly against the main clump. This year, it sailed though our winter cold of 11F. It’s been almost a decade since we’ve offered this, so perhaps it’s time we propagate a few more to share.
In 2011, we spotted a tiny creamy white streak on a single leaf of a small pup, which was potted for further observation. After several years, and thanks to crown cutting, we were able to produce a highly-streaked plant, which we call Agave ‘Craziness’…see below.
Several years later, we were able to isolate the streaked leaves into a stabilized central variegation we named Agave ‘Bareback Rider’. Although winter hardiness also disappears with the creamy white foliage, it still makes a superb container plant. With that much white in the leaf, the growth rate has also slowed dramatically. It’s our hope that within the next year or two, we can finally release this amazing form through Plant Delights.
Our 13 year old clump of the evergreen Japanese Asarum asperum is looking superb in the garden this week. Looks like it’s about time to divide this for the first time and start to build up stock so we can share in the future. Winter hardiness is Zone 6-9.
We can’t imagine there are many people who grow cast iron plants from seed, but we have found the results quite fascinating. Below are a couple of our seedling which we found good enough to name. Neither has been divided yet, and are still under evaluation, but we think they have good potential.
Aspidistra ‘Bright Lights’ is a 2015 seedling from Aspidistra ‘Okame’ and has a similar variegation pattern, although it has more white banding than its parent.
Aspidistra ‘Illumination’ is a 2016 seedling of Aspidistra ‘Sekko Kan’, and inherited the white tips from its mama, but has also pickup up more streaking that wasn’t present in the preceding generation, so perhaps it outcrossed to a nearby streaked parent. If you’re interested in trying this yourself, the seed are found in a 1-2″ wide green ball at the base of the plant now. The seed should be mature in the next 4-6 weeks.
I had to chuckle as folks on several Facebook plant groups were wringing their hands in worry prior to the recent cold snap, while we were secretly hoping for even colder temperatures than forecast.
JLBG registered three consecutive nights in the teens recently; 11F, 19F, and 19F. While this was certainly not abnormal for our area, folks with very short memories thought the horticultural world was coming to an end. In reality, we recorded similar temperatures in the winter of 2017/2018, albeit a week later that year.
When we first started the gardens at JLBG, we were squarely on the Zone 7b side of the Zone 7a line. We are now on the Zone 7b side of the Zone 8a line. In order words, we have shifted about 1/4 of a hardiness zone. Since 2018, JLBG has registered three consecutive Zone 9a winters, so it’s not surprising the new gardeners or those with short memories start assuming that all kind of plants are reliably winter hardy, which is not the case.
We long for cold temperatures because we want and need good winter hardiness data, and while mild winters may be enjoyable to us Homo sapiens, we don’t learn anything about plant hardiness from those winters. So, here are a few things we learned this year.
Agave weberi ‘Stone Cold Austin’ is Patrick McMillan’s collection of Agave weberi from Austin, Texas. We’ve tried Agave weberi a couple of times prior, and could never get it through one of our milder winters. Patrick’s original plant at Clemson got large enough to flower there, so we’re hoping for the same. The older foliage is showing damage from 11F, and will most likely be lost, but the bud seems fine so far.
We’ve never had any luck with any of the dwarf Agave lechuguilla mutants we’ve tried in the garden, but this new one, shared by plantsman Hans Hansen, that we call Agave ‘Tater Tot’, had no problem with 11F. These are often sold as Agave x pumila, which actually doesn’t exist. Everyone assumed that A. x pumila was a hybrid, but when one in Europe recently mutated back to the original form, it turned out to be nothing more that a super dwarf form of Agave lechugullla.
Mangave ‘Racing Stripes’ is a plant we had high hopes for in terms of winter hardiness, but we had not had a cold enough winter to get good data. Our only reservation was that it contains genes from the tropical Agave gypsophila. Thankfully, our plant came through the 11F freeze in reasonably good shape. The wrinkled nature of the older leaves are indications of cold damage that will show up in a few more days, but the core seems intact and should re-grow.
We fully expected Bambusa multiplex ‘Green Giant’ to be defoliated after 11F and the stalks killed to the ground, but our fully exposed clump still looks like it’s mid-summer…at least from the north side.
On the south side, the same clump has fried foliage. There are typically two causes for such damage. One is wind desication when the winds are blowing from a single direction and the ground is frozen, making it impossible for the plant to replenish water lost through the foliage. During the time that our ground was frozen, our winds were coming from the West, so that wouldn’t account for damage only on the south side of the plant.
In this case, the more likely scenario is that this is due to sun scorch when the soils was frozen, since the damage is on the south side. If the canes are indeed undamaged, as it appears, new leaves should reflush in spring.
We didn’t hold out much hope for the Mexican palm, Brahea decumbens, but it sailed through 11F unscathed.
Since we know that genetics matters, we will often plant more than one clone of a marginal plant like a new palm. Below are two seedlings of the small-seeded European Fan Palm, Chamaerops humilis var. microcarpa. The first shows significant foliage burn, while the second plant, growing nearby shows no damage after 11F.
The hardiest of all Sabal palmetto forms are those from NC’s Bald Head Island. Our plant from there came through the cold unscathed. We expect many local businesses and even homeowners who purchase large trunked forms directly from Florida growers will probably be in for a disappointing spring.
All of our hardy cycads have assumed the straw-color we see every year when the temperatures drop below 18 degrees F. The plants are fine, but we recommend waiting to remove the dead fronds, since doing so now, can cause the new foliage to emerge in the middle of winter, which is never a good idea. April 1 is our target date to remove the fried foliage.
One of the real surprises was the fried foliage of Viburnum ‘Moonlit Lace’, where it was growing in full sun. The same plant growing in shade looks untouched. The stems are fine and the plant should re-sprout fine, but gardeners who grow this in full sun may be disappointed.
This is the coldest temperatures we’ve seen since planting Patrick’s hardy selection, Opuntia microdasys ‘Dripping Springs’. Our clump looks great after the cold. It’s hard to imagine that this clone is so much more winter hardy than any of the other forms of this species that we’ve tried previously and killed at much warmer temperatures. Although we don’t offer this for sales, I’ll remind you of our great prickly pear cactus giveaway at our Summer Open Nursery and Garden in July.
The Mexican Sedum praeltum looks a bit sad, but actually seems to be fine with sound buds up and down the stem. This little-known perennial forms a plant that looks almost exactly like the tender Jade plant, Crassula ovata.
Lastly, our patches of Living Stones, Lithops aucampiae, sailed through 11 degrees F. I wonder if we can ever get all the disinformation on the Internet regarding their tolerance to cold corrected.
We love camellias, but we really love the amazing banded leaf, variegated camellias, of which we’ve assembled a decent collection. Here is our plant of Camellia japonica ‘Taiyo’ in the garden now, which is just absolutely striking.
Our oldest clump of the North American native Agave lophantha ‘Splendida’ is preparing to celebrate its 10th anniversary in the garden at JLBG. What started as a single pup, now has an extended family. Please join us in sending birthday wishes to this great century plant selection.
This is a very good year for the annual winter fruit show on Rohdea japonica (sacred lily). The attractive berries remain until early March, when they begin to drop. Although seed from these cultivars do not come true, you’ll always end up with an interesting variety of offspring.
Here’s a new photo of Agave parryi ssp. huachucensis ‘Excelsior’ from our garden this week. We typically don’t have many variegated century plants that will survive our winters, but this is one of the exceptions. This superb clone was first introduced in 1967 from a small California nursery by the same name. Protection from excess winter moisture and exceptional drainage is always the key in cold, wet winter climates. This particular planting is under a roof overhang. Hardiness zone 7b to 9b.
We have been fascinated with hardy cyclamen since the 1960s, but in recent years have spent a bit of time isolating some of the best silver-leaf variants that showed up in our seed pots and getting these established in the garden. These silver leaf oddities can be found in the wild, although they are fairly rare. In cultivation, however, they come fairly true (50%) from seed.
Through Plant Delights, we offer these as seed strain cultivars, under the names below…when available. A new crop of cyclamen will go on-line January 1, and there are some real beauties. Here are some images from the garden this week. Winter hardiness is Zone 4a-8b.
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’.
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.
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.
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.
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.
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.
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.
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.
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.
We always look forward to elephant ear evaluation day at JLBG, which was recently completed.
Each year, Colocasia breeder, Dr. John Cho flies in from Hawaii to study and select from our field trials of his new hybrids. This year we were joined by Robert Bett, owner of the California-based plant marketing firm, PlantHaven, who handles the Royal Hawaiian elephant ear program. The JLBG trials consist of all named colocasia introductions growing alongside Dr. Cho’s new hybrids created the year prior.
JLBG staff members, Jeremy Schmidt and Zac Hill spent most of the morning working with Robert and John on the time-consuming evaluation process.
After lunch, Jim Putnam from Proven Winners, joined us to see which remaining plants struck his fancy for potential introduction into their branded program. As you can see, lots of amazing plants didn’t make the final cut, which is necessary, since we’ll need more room for the new selections.
Plants selected for introduction are then sent to a tissue culture lab to be produced for the next step, which is grower/retailer trials. If these are successful, and the plant can be multiplied well in the lab, the plants are scheduled for retail introduction.
Hopefully, by now, most folks are familiar with our 2020 top selection, Colocasia ‘Waikiki’, which hit the market this year. There are more really exciting new selections in the pipeline, but we can’t share photos of those quite yet…stay tuned.
Looking particularly lovely in the late summer garden is Fatsia japonica ‘Murakumo Nishiki’. This irregularly gold variegated form of the typically solid green tree ivy is a star in the light shade garden. This evergreen gem is a great way to add a spot of color in the woodland garden year round. Hardiness is Zone 7b-10b.
One of our favorite evergreen shrubs is the queen of the variegated boxwoods, Buxus sempervirens ‘Elegantissima’. This plants thrives in part sun to light shade, where it looks great every month of the year. This excellent clone, which has been grown in Europe since the mid-1800s, matures at 5-6′ in height. Not only is it great in the garden, but if you have enough, you can cut some to use as a foliage filler in flower arrangements.
We’ve long been fascinated by Amorphophallus konjac ‘Shattered Glass’, an unstable variegated cultivar, developed by plantsman Michael Marcotrigiano. Some years, the foliage emerges solid green, other years with a small bit of sectoral variegation, and this year with a fully variegated leaf.
I’m more and more impressed with Hosta ‘Miss America’ each year. Not only is this white-centered hosta amazingly vigorous, but it has one of the finest floral shows we’ve ever seen on a hosta. The steel rod-like upright flower stalks on our plant have reached 4′ tall, but as the plant grows larger, they will eventually top 6′ in height. Not wind, rain, or post office vehicle can knock down these super sturdy stalks, and the great show they provide for weeks. Our plant is 100′ from our back porch, and it shows up like a floral beacon even from that distance.
One of our favorite broadleaf shrubs is undoubtedly Orixa japonica ‘Pearl Frost’. Orixa is a monotypic (one species) genus in the citrus (Rutaceae) family, that’s virtually unknown in US gardens.
We are particularly enamored with this superb variegated form, brought into the US by plantsman Barry Yinger. Orixa ‘Pearl Frost’ matures at 8′ tall x 6′ wide, and we have found it to thrive in both full sun to light shade, although full sun plants require more moisture.
We love the spineless Agave bracteosa ‘Stingray’ in the garden. We’ve had these dotted throughout the garden since 2017, and so far, with good drainage, they’ve handled our winters quite well, which is certainly not normal for a variegated century plant. This particular species prefers part sun to light shade. Hardiness is Zone 7b/8a and warmer.
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.
Looking lovely today is the amazing Agave x romanii ‘Shadow Dancer’. This fascinating agave is a man-made hybrid between two Mexican species, Agave filifera and Agave mitis. Not only is it a hybrid, but this selection has a fascinating variegation pattern that’s not seen on any other century plant. The new growth emerges ghostly cream with a muted green border. As the leaves age, they green disappears and the leaves become pure parchment white. Despite the seeming lack of chlorophyll, Agave ‘Shadow Dancer’ has amazingly good vigor and doesn’t burn in full sun. This has potential winter hardiness for Zones 8b and south, but needs more trialing to know for sure. In other climates, it’s a great container specimen.
This spring, one of our flats of Rohdea japonica seedlings turned up with an inordinate number of variegated seedlings. In a flat of approximately 1,000 seedlings, we typically expect 3 – 10 variegated offspring, when the parent plant has white streaking in the middle of the leaf (L2 layer).
All of the variegated seedlings were removed and potted individually last week…all 300 of them. It will be fascinating to see what unique forms result.
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.
Here’s a garden shot at JLBG, using a good bit of gold foliage in addition to flowers. Left to right: Viburnum dentatum ‘Golden Arrow’, Sinningia ‘Amethyst Tears’, Baptisia ‘White Gold’, Canna ‘Tama Tulipa’, Lysimachia nummularia ‘Aurea’ (groundcover), Hibiscus ‘Holy Grail’ (purple), Spirea thunbergii ‘Ogon’, Trachycarpus fortunei (palms).
Ever since I saw my first dragon’s-eye pine over 40 years ago, I was smitten, and throughout the years have been fortunate to collect several different named cultivars with this unique trait where the new needles emerge bicolor white and green. Here is our young specimen of Pinus densiflorus ‘Burke’s Red Variegated’ looking lovely in the gardens this week. This selection of the Japanese red pine, originated as a seedling from Long Island’s Joe Burke, from the cultivar Pinus densiflorus ‘Occulis Draconis’. Hardiness is Zone 5-8.
Below are two variations on a theme…calla lilies in the garden. Here is Zone 7b, both are reliably winter hardy in the ground.
The striped-leaf selection of the winter-blooming South African native, Zantedeschia aethiopica ‘African Gold’ has looked fabulous all spring, where we have it planted in a seep, which gets full sun for 3-4 hours in the morning.
Zantedeschia ‘Picasso’ is a hybrid, created using several of the summer-flowering South African native calla lily species. Here it is in our garden in mid-June, where it gets 4-6 hours of sun daily, and the soil stays reasonably moist.
We often hear and read that hostas won’t grow well in the mid and deep south, so we thought we should share a few garden photos from this week at JLBG (Zone: 7b), to bust yet another garden myth.
Starting with some small/miniature hostas, the first is Doug Beilstein’s Hosta ‘Baby Booties’, a superbly vigorous dwarf that has really been exceptional.
Hosta ‘Blue Fingers’ is a PDN/JLBG introduction of one of the very few tiny blue-leaf hostas with excellent vigor and a good multiplication rate.
Hosta ‘Wriggles and Squiggles’ is an exceptionally wavy-leaf, small, gold introduction from plant breeder, Hans Hansen.
Hosta ‘Fire and Ice’ is another Hans Hansen introduction that was a reverse sport of Hosta ‘Patriot’. It fares much better when given more light, even a few hours of sun in the morning.
Hosta ‘Swamp Thing’ is a PDN/JLBG introduction with great vigor and glossy foliage
Hosta ‘Beyond Glory’ is a Hans Hansen sport from Hosta ‘Glory’. This is just one exceptional hosta, which also benefits from a bit of morning sun or very open shade.
Hosta ‘Diamond Lake’ is a stunning new Hans Hansen creation with large blue corrugated leaves with exceptional leaf rippling.
Hosta ‘Gold Meadows’ is one of our favorite sports of Hosta sieboldiana ‘Elegans’. When the weather warms, the central pattern fades to solid blue, but in spring, it’s absolutely stunning. It has also shown great vigor in the Southeastern US.
Hosta ‘One Last Dance’ is a Hans Hansen/Walters Gardens sport of Hosta ‘Dancing Queen’. We think it’s hard to beat this amazing plant. The vigor is evident in our photo.
The lovely native witch hazel, Hamamelis virginiana ‘Little Prospect‘ with its variegated foliage, looks amazing even when it isn’t in flower. The leaves show no foliar burn in full sun and it is just as beautiful in part shade. Hardiness Zone: 3a to 8b.
Here are a few of the many buckeyes that are looking good at JLBG this spring.
Aesculus pavia is native from Illinois south to Texas and east to Florida. Hardiness is Zone 4-8.
The European Aesculus hippocastanum has thrived for us, despite most sources claiming we are too hot in the summer. Aesculus ‘Hampton Court Gold’ emerges with ghostly yellow foliage for an amazing spring show.
Aesculus x carnea is a hybrid of the European Aesculus hippocastanum and the American Aesculus pavia. This cross was first discovered in Europe in 1812. It is quite stunning in our garden as you can see. Hardiness is Zone 5-8.
The dwarf form of Aesculus glabra only occurs in a small region of Northern Alabama/Georgia. Mature size is 5-6′ tall. Hardiness is Zone 5-9.
Aesculus sylvatica is one of our oldest buckeye specimens in the garden. This species is native from Virginia to Alabama. Hardiness is Zone 6b-8b.
Aesculus sylvatica ‘Sylvan Glow’ is Jeremy Schmidt’s discovery of an amazing seedling of Aesculus sylvatica that emerges rosy red, then changes to orange, before aging to green for the summer. When it gets a bit larger, we will try to propagate this so we can share.
Here are some of our favorite Japanese maples looking quite lovely in the garden this week, starting with Acer palmatum ‘Geisha Gone Wild’. This Buchholz Nursery introduction is a fascinating sport of Acer palmatum ‘Geisha’.
The leaf color of Acer palmatum ‘Tsuma Gaki’ has to be seen to be believed.
Our favorite of the weeping cutleaf purple cultivars is Acer palmatum ‘Orangeola’. Our specimen is now 27 years old.
Even when the sun isn’t out, the golden willow, Salix sachalinensis ‘Golden Sunshine’ provides a bright spot in the garden. We love this amazing tree. I see quite a few sources who list this on-line as maturing at 18′ tall x 7′ wide. Well, that’s not quite accurate. The five year old specimen pictured below is now 25′ tall x 25′ wide. Growth is much faster in moist, rich soils, but it seems someone needs to trade in their tape measure.
Solomon’s Seals comprise several genera of woody perennials, but the common name is most commonly associated with the genus, Polygonatum in the Asparagus family. It seems hard to imagine, but the Asparagus family now includes many popular garden plants including its namesake Asaparagus, but also hosta, agave, liriope, ruscus, and yucca.
The genus Polygonatum is native through much of the world, although the center of distribution is in Asia. We’ve been collecting these amazing woodland perennials for years, and now have a collection of over 380 different taxa. Here are a few from this week in the garden.
Polygonatum mengtzense is a dwarf, rarely cultivated species from North Vietnam.
The dwarf, glossy-leaf Chinese Polygonatum nodosum just oozes elegance.
When you run out of species to grow, you start creating hybrids. This is our new selection of a cross of the giant Polygonatum martinii and the more compact, Polygonatum falcatum. We’ve named this clone Polygonatum x marcatum ‘Winsome Wonder’
Polygonatum odoratum ‘Chanticleer’ is a superb, large-leaf form of the Asian Polygonatum odoratum that I spied at Chanticleer Gardens, and they kindly shared in 2006. Hopefully, we’ll finally have enough to share next year.
Polygonatum odoratum ‘Angel Wings’ (aka: ‘Carlisle) is a superb form of Polygonatum odoratum from Massachusetts plantsman, Roy Herold. This gem grows in both half day sun as well as shade.
Over the last few weeks, I’ve been working on a plant survey of a local woodland area of about 30 acres. The low, moist areas are filled with Arisaema triphyllum, (Jack-in-the-pulpit) which is quite common in our area. The first image is what is typical for the species.
I’ve been studying patches of Jack-in-the-pulpit for well over 55 years, always looking for unusual leaf forms that showed any type of patterning. Until last month, I’d never found a single form with atypical foliage. That all changed with my first trip to this local site, where so far, I have found several dozen forms with silver leaf vein patterns. Up until now, there are only two pattern leaf forms of Arisaema triphyllum in cultivation, Arisaema ‘Mrs. French’ and Arisaema ‘Starburst’.
Each patterned leaf clone varies slightly as you would expect within a population including both green and purple stalk coloration.
While I’d never found any true variegation prior to this, I had found plenty of transient leaf patterning caused by Jack-in-the-pulpit rust (Uromyces ari triphylli). This site was no exception, with a number of plants showing the characteristic patterning. If you find these, turn the leaf upside down and you’ll see the small orange rust pustules.
While these may seem exciting, the pattern are not genetic and will disappear without the fungus. Fortunately, this rust can be cured by cutting off the top of the plant and discarding it where the spores can not spread via the wind. Infected plant should be fine, albeit smaller next year. The susceptibility of Arisaema triphyllum to jack-in-the-pulpit rust varies with genetics. Of the tens of thousands of plants I observed at the site, less than 10% were infected with the rust.
Arum are a fascinating genus of hardy aroids, known by most gardeners from a single southern European species, Arum italicum. The most popular cultivar of Arum italicum is Arum ‘Marmoratum’. The key to enjoying arums is to not let the seed drop everywhere, since you can get easily get over-arumed. Flowering season is now, followed by seed season. Each seedling has a different pattern from the original, so it’s a personal preference whether to remove seed or not.
Arum apulum is a little-know species that is rarely seen in cultivation, native only to a small region of Southern Italy. Our flowering plants in the garden now are from a wild collection made by a plant explorer friend.
Below is an interesting hybrid between Arum italicum (central to southern continental Europe) and Arum dioscorides (Mediterranean). Arum italicum has patterned leaves, but solid green flowers. Arum dioscoridis has solid green leaves and spotted flowers. The hybrid, Arum ‘Chui’ is an introduction from UK plantsman John Grimshaw. We added the notospecific (hybrid) name Arum x diotalicum. These hybrids have both spotted/speckled leaves and flowers.
We love all of our trout lilies, but Erythronium ‘Goldstrike’ is hard to beat. This is our named selection of Erythronium americanum ssp. harperi. Occurring from Tennessee south of Mississippi, this amazing form graces low woodlands in very early spring. This collection was made by our Plant records/taxonomist, Zac Hill in Alabama. Hardiness is Zone 6-9 at least.
Carex conica ‘Hime’ has been in horticultural commerce for many decades, and remains a superb woodland garden sedge. The evergreen species Carex conica is native throughout Japan, where it occurs in woodland conditions. This variegated selection that goes by an array of names such as ‘Snowline’ and ‘Marginata’, but Carex conica ‘Hime’, which translates to “princess” seems to the the correct cultivar name. The tight 10″ tall x 20″ wide clumps of narrow white-edged leaves are topped with this fascinating floral show for us in early March. In 35 years of growing this, we have yet to see a single garden seedling.
Trillium cuneatum ‘Oconee Gold’ is a rare gold-flowered selection of the typically purple-flowered southeastern toadshade. We found our original plant of this in Oconee County, SC, and have propagated them from seed since that time. If we keep the yellow-flowered plants isolated from purple-flowering clones, we have more than 50% that reproduce with yellow flowers. The time from seed to flower is usually five years. Winter hardiness is Zone 5a-8b.
Podocarpus macrophyllus ‘Okina’ is looking lovely this winter. This Japanese selection has resided at the base of a large pine tree at JLBG since 2001. We love the white speckled foilage, which really shines in the winter months. Podocarpus macrophyllus is one of a short list of conifers that thrives in the shade of a woodland garden. Our 20 year old plant is now 6′ tall. Hardiness is Zone 7b-10b.
We treasure any plant that makes a great woodland groundcover, and are particularly smitten with the ophiopgon (mondo grass) and liriope (monkey grass) selections. We currently grow over 120 different ophiopogon accesions including quite a number of wild collections, at JLBG…see what a touch of OCD does for you. We’ve grown Ophiopogon ‘Comet’ since 1997, and love it for its white striped foliage and well-behaved growth habit. Hardiness is Zone 7b-10b.
I borrowed the title from our good friend Jim Dodson’s book for this post about Ulmus parviflora ‘Golden Rey’. One of the most admired trees in our garden is our specimen of Gold-leaf lacebark elm. The bark, as you can see below is absolutely fabulous both in winter and summer.
The problem is that lacebark elm is a notorious seed producer, and in our garden, it seems like every one germinates. Our love/hate relationship with this species has so far resulted in the removal of four different mature cultivars from our garden so far.
Here’s where genetic engineering (GE) could actually help. Notice, we are using the term GE, as compared to the incorrectly used GMO. All, plants, unless they come directly from the wild, are genetically modified organisms (GMO). Humans would cease to exist as we know them without GMO’s, so, please try to use the correct terminology. What people are crusading against in food crops is actually genetic engineering (GE). Hoping down now from my soapbox.
It’s actually quite easy to sterilize a plant, using one of the genetic engineering tools known as CRISPR. Just think of this GE surgery as a horticultural vascectomy…a couple of snips and you’re done making babies. It will be interesting to see if public sentiment for non-edible crops allows genetic engineers to solve such problems with making some amazing plants like the widely planted lacebark elm more palatable to gardeners who are concerned about its potentially invasive tendencies.
Here are a couple of images this week from the garden of our older clumps of Cyclamen hederifolium. For garden areas that are dark and dry, where nothing else grows, cyclamen are your best bet. Of the plants below, one is at the base of a cryptomeria and the other at the base of a pine. Although they flower from August until Christmas, the winter foliage is just hard to beat. Hardiness is Zone 4a-8b.
This winter has been an amazing one at JLBG for the mid-winter flowering, evergreen magnolias. Formerly known as Michelia, there are several species from warm temperature Asian climates, which flower in the mid-winter. The plant in the top photo is our oldest specimen of Magnolia platypetala, and below is Magnolia macclurei…both planted in 1999, and in full flower in January. Obviously, we will loose open flowers if winter night temperatures drop too far below freezing, but the remainder of the flower buds usually open shortly after temperatures warm.
Also, the bright gold shrub in the first image is the original plant of our introduction, Illicium parviflorum ‘Florida Sunshine’…the plant from which all plants in the world were propagated. To the lower right is the Mediterranean native, Phlomis fruticosa ‘Miss Grace’. All in all, a lovely winter garden combination.
Pittosporum tobira ‘Kansai Sunburst’ is looking lovely in the mid-winter garden. This Japanese selection emerges with brightly cream-edged leaves which age to green. This selection came to the US, via the former Asiatica Nursery, which brought so many wonderful Japanese selections to American gardeners.
This native of China, Japan, and Korea should mature around 10′ in height. Pittosporum tobira is prized for its spring-produced, intensely-fragrant small white flowers that smell like orange blossoms. We’ve had our plants in the ground since 2007, so they’ve passed the survival test of two winters with low temperatures in the single digits F. Winter hardiness is Zone 7b and warmer.
Asarum hypogynum ‘Artist’s Palette’ is in full flower here at JLBG in late January. Despite being first published in 1915, this little-known species is very poorly represented in ex-situ plant collections worldwide. Our clone is a division from a wild plant we brought back from our 2008 botanical expedition to Taiwan. The foliage on this species is some of the largest in the entire genus. For us, Asarum hypogynum starts flowering in late summer and continues most of the winter. We are working to eventually be able to share this with other collectors. Hardiness is Zone 7b and warmer.
Asarum minus ‘Cupid’ is one of our heavily silver patterned selections of our native wild ginger. When cold weather arrives, the evergreen leaves take on a lovely purple cast. This is an excellent clonal selection we made in 1994 from a construction site, and one we hope to offer in the future though Plant Delights Nursery.
Here’s an image taken this month of the wonderful Aucuba japonica ‘Limbata’. While most aucubas have yellow leaf specks, this old cultivar, first mentioned in historical literature in 1864, is sadly still quite unknown in gardens. That’s not too surprising, however, due to its slow production time as a commercial nursery crop. For dry shade in Zone 7a-9, this wonderful broadleaf evergreen is hard to beat.
One of our favorite winter hardy (Zone 7b) century plants is the non-spiny Agave bracteosa ‘Stingray’. Here is one of our garden specimens this week, which has been thriving in the ground since 2016. Unlike most agaves, which prefer full sun, Agave bracteosa is better in part sun (full sun for only a few hours during the day). Agave bracteosa ‘Stingray’ is also a fairly slow grower that only produces a few offsets. A mature rosette will top out around 15-18″ tall x 2′ wide. We love the unique texture, which differs from all other agaves.
Here’s one of our favorite hollies, looking great in the garden this week. Ilex integra ‘Green Shadow’ is a variegated (creamy-edged leaves) form of the Mochi holly. This amazing columnar holly, that hails from oceanside mountain slopes in Japan, Korea, Southern China, and Taiwan, reaches 20′ tall x 7′ wide, which is the case with our 16 year old specimen. Although Ilex integra ‘Green Shadow’ will grow in both sun and shade, full to half day sun results in the most dense foliage. This is female clone, but we never see more than a dozen berries, so we assume it needs a male nearby to fruit better. For a narrow evergreen screening plant, it’s hard to beat. Hardiness is Zone 6b-9b.
One of the last plant exploration trips the late plantsman Alan Galloway made, was to Majorca, Spain. Alan was so excited to return home with some special selections of the fall-flowering Arum pictum, which typically has solid green foliage…except on Majorca. This beautiful form is known by collectors as Arum pictum var. sagittitifolium, although the name isn’t considered valid due to the natural variability in leaf patterns. This is Alan’s favorite form from his trip, to which we added the cutlivar name, A. pictum ‘King James’. It seems that back when Majorca had kings (thirteenth and fourteenth century), before its merger with Spain, they had a propensity for naming most of them, James.
One of many exciting new introductions for 2022 is Phlox divaricata ‘Blue Ribbons’ PPAF. This variegated version of our wonderful native woodland phlox was discovered here as a single sport in our garden by our plant taxonomist, Zac Hill. Instead of being all green, each leaf is edged with a wide creamy border and flushed with pink during the colder months. In early spring, the entire clumps are topped with sweetly fragrant blue flowers. We think Phlox ‘Blue Ribbons’ is an incredible design addition for the woodland garden. Hardiness is Zone 3-8. The new catalog, with this and many other amazing gems, goes on-line in 2 weeks!
Here is the wonderful Fatsia japonica ‘Variegata’ in our garden on Oct 25. This fabulous shrub is a member of the aralia family, and a first cousin of the off-despised running ivies. Not only do we love Fatsia for its amazing bold texture and evergreen foliage, but we love it because it flowers in fall. The second photo was taken a mere four weeks later, when it had exploded in full bloom.