Holy Giant Holly Fern

Cyrtomium macrophyllum is looking particularly fabulous this year. This is a little-grown holly fern with a wide range from India to Southeastern China that can be found at elevations from 2,500-8,000′. The bold textured fronds arch outward to make a 2′ tall x 2′ wide clump that is semi-evergreen in most winters. It seems as if we will get good spore set this year, which may mean another offering since the last time PDN had it to share in 2003.

Engler’s Arum

Most gardeners are familiar with arums, but few know Engler’s arum…aka: Englerarum hypnosum, a genus first recognized in 2013. This horticultural oddity was kicked out of several better known aroid genera (Colocasia and Alocasia) due to its odd genetics (anastomosing laticifers and colocasioid venation). The lone species of Englerarum can be found in forests from Southwest China to Southeast Thailand, where it grows as a lithophyte (lives on rocks) on karst limestone, spreading by rhizomes to form large colonies. It has been surprisingly winter hardy for us, surviving upper single digits F, when growing in typical garden soils, where it reaches 5′ in height with 30″ long leaves. Here is our patch at JLBG this summer.

Casting About

Over the last few years, we’ve been growing more and more aspidistra (cast iron plants) from seed in the garden. Here are a few of our more interesting seedlings. The first is from our search for a narrow-leaf selection of the common Aspidistra elatior, which has been christened A. ‘Thin Man’. The second is a streaked and spotted form that we named A. ‘Zodiac’. The third is a yet un-named seedling from Aspidistra ‘Snow Cap’. Surprisingly, the white leaf tip trait comes consistently true from seed.

Aspidistra elatior ‘Thin Man;
Aspidistra elatior ‘Zodiac’
Aspidistra elatior JLBG-035

Celebrate Plasticity

We live in an age where many plastic products are vilified, but every now and then, we find a reason to embrace the texture of plastic. Such was the case in 2008, when we visited The Missouri Botanic Garden. Walking through one of their greenhouse, I spotted an odd holly fern, planted in the middle of a large mass of Cyrtomium falcatum. The foliage appeared much thicker and more glossy than any of the other plants. The staff was kind enough to share a piece, which we subsequently named Cyrtomium ‘Plasticity’. We theorize it is probably a ploidy mutant with an extra set of chromosomes that would account for the extra thickness and glossiness. Here is a photo from the gardens this week, where it has become a favorite.

Elliptical Ginger Lily

Here’s another oddity in the fabulous ginger genus, hedychium. First, Hedychium ellipticum requires shade, compared to most hedychiums that need sun to flower. Also, Hedychium ellipticum has pendant stalks, compared to the rigidly upright stalks of most more commonly grown ginger lilies. We love the elegant flower heads that adorn the garden in late July/early August. This photo is from the gardens at JLBG last week. Hardiness is Zone 7b south. Sadly, this is always a poor seller when offered by Plant Delights…perhaps people just need to see this in person to appreciate its exquisite beauty.

Shaking up Saxatile

For two decades, we’ve grown the amazing Chinese jack-in-the-pulpit, Arisaema saxatile with its delightful lemon-fragranced flowers. The most frustrating part was its slow offsetting nature, which meant we rarely had any to share.

Arisaema saxatile

Eighteen months ago, we dug our main clump and moved most of it from a well-shaded site to a location that would get a couple of hours of afternoon sun. To our surprise, it loved the new site, where this summer, it produced two large seed heads which will be harvested shortly. This is the first sign of seed in 20 years, so hopefully in a few years, we have some good numbers to share.

Arisaema saxatile in seed

Upside down Spider Fern

Arachnioides standishii is one of our favorite garden ferns. This particular collection comes from Japan’s Mt. Daisen. The common name is Upside down fern since the leaves appear to be attached inverted. Production is always challenging since spore don’t ripen until after Christmas. The foliage remains evergreen until temps drop below 10 degrees F. Hardiness is Zone 4-8.

Pink-a-Blue

We always love seed set on the love lily, Amorphophallus kiusianus. This species is one of the few amorphophallus which sets seed without a mate. The seed start out a raspberry pink and gradually mature to blue. Seed can be planted once they turn blue, but will not germinate until the following June.

Alan’s Laosy Giant

The late plantsman Alan Galloway was a prolific plant collector in Southeastern Asia, and one of the plants that has surprised us with its winter hardiness is the giant evergreen Solomon’s Seal, Disporopsis longifolia. In the wild, Alan and I encountered this throughout Thailand and Vietnam, but our tallest clone is one which Alan collected in Laos, and we christened Disporopsis longifolia ‘Alan’s Laosy Giant’. Our clump, which has been in the garden since 2007 has topped 5′ in height and is in full flower this week. Sadly, it has yet to produce a single offset.

Welcome back, Katherine

Every year around July 4, we celebrate with our own horticultural fireworks show as the South African Scadoxus multiflorus ssp. katherine bursts into flower. Here are our plants at JLBG this week. This amazing bulb requires light shade to grow and thrive. Anyone whose woodland gardens suffers from the summer doldrums, would do well to include Katherine. Hardiness Zone 7b-10.