Oxblood, maroon, deep violet and ebony; dark plants are one of my greatest horticultural passions. From the statuesque Cimicifuga racemosa ‘Hillside Black Beauty’ gracing my Secret Garden, to the massive, dark cloud of Physocarpus opulifolius ‘Diablo’ forming a shadowy hedge at the back of my perennial borders, I wholeheartedly embrace the gothic beauty of black foliage. Earlier this year, in my posts, “A Heart of Darkness” and “The Gothic Gourmet: Black Beauties and Dark Delights of the Potager”, I revealed a bit about my obsessive preoccupation with these strangely curious and hauntingly beautiful plants. But you needn’t be Edward Gorey to appreciate the darker side of horticulture. Deep, rich hues are incredibly useful in garden design; offering a counter-point to subtle silver and sophisticated chartreuse, as well as a striking contrast to variegated foliage and boldly colored flowers. Dark, elegant plants enrich a garden’s beauty in much the same way as late afternoon shadows enhance a sun-drenched landscape. Think of them as the minor chords in your favorite song…
Physocarpus opulifolius ‘Diablo’ at the back of my casual, mixed meadow border in August
One of my favorite native plant cultivars, Physocarpus opufolius ‘Diablo’, (as well as cultivars ‘Center Glow’ and ‘Summer Wine’) is just such an endlessly versatile plant. Stunning as a single specimen within a mixed border, I like to take the drama up a notch in larger gardens, combining this burgundy-leafed shrub in groups of three or more to form a dark and mysterious backdrop for other plants (particularly gold and chartreuse-leaved specimens, as well as those with variegated foliage). Perennials in shades of blue, violet, gold, magenta —as well as many other bold and subtle colors— stand out against the intense, maroon-leafed ‘Diablo’. One of my favorite, striking garden combinations plays the nearly black color of Physocarpus opufolius ‘Diablo’ against the feathery, chartreuse leaves of Sambucus racemosa ‘Sutherland Gold‘ (Golden elderberry).
Physocarpus opulifolius ‘Diablo’ forms a soft, dark cloud at the edge of my terrace
Physocarpus opulifolius (also known as common ninebark) is an extremely hardy shrub (USDA zones 2-8) native to North America. The dark, burgundy-leafed cultivar ‘Diablo’ (sometimes listed as ‘Monlo’ or ‘Diabolo’) will reach a height of 6-10 feet, with a similar spread. Physocarpus opulifolius presents a graceful, upright-vase shape in the garden, with softly arching branches. Adaptable to many garden situations, ‘Diablo’ offers dramatically dark foliage throughout the growing season, burnished shades of rust to bronze in autumn, and textural, peeling bark in winter. The pinkish white blossoms appear in late spring, and are a favorite, natural food source for honeybees and butterflies. Later in the season, as the tiny red fruits ripen —strangely beautiful against the dark foliage— common ninebark becomes a living feeding station for birds and small mammals. Physocarpus prefers even moisture and neutral, well-drained soil. This native cultivar is an easy to please, disease and pest resistant plant suitable for sun to partial shade (if worms/caterpillars become a problem in late spring, defoliating branches, treat the leaves with OMRI approved Btk only as necessary).
Physocarpus opulifolius ‘Diablo’ Leaf and Stem Coloration
In addition to its striking presence in the garden, Physocarpus opulifolius ‘Diablo’s’ leaves and branches add sophisticated beauty to floral arrangements. When combined with citrus-colored flowers —such as the Bells of Ireland shown below in a vase by raku artist Richard Foye— ‘Diablo’ is a real knock-out. The sturdy stems also offer excellent support for more delicate flora, and a lovely vertical compliment to blowzy hydrangea blossoms — Hydrangea paniculata ‘Limelight’ is especially lovely with the maroon leaves of ‘Diablo’.
A vase by Richard Foye, filled with Physocarpus opulifolius ‘Diablo, Bells of Ireland, Baptisia foliage, Queen Anne’s Lace and Apricot- Hued Foxglove
Article and photographs © 2010 Michaela at The Gardener’s Eden
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