The shrubs that furnish a garden. Small and medium shrubs are the versatile, human-scaled woody plants that fill borders, edge paths, and knit the taller structure to the ground, the layer most gardens rely on most.
Camellia rosaeflora is a graceful species camellia from China, one of the lesser-known kinds Woodlanders keeps in circulation for American gardeners. The habit is open and upright, the leaves small and fine for the genus, and in early spring the branches carry masses of small pink flowers, roughly an inch across and lightly double, in such profusion that the spent petals often fall to lay a soft pink carpet on the ground beneath.
Native to Central and South America but naturalized across the tropics, this fast-growing shrub flowers not in spring or summer like a well-behaved plant but in autumn and into early winter, hanging great loose clusters of clear, saturated yellow at the ends of arching branches, each bloom built around curved stamens that give a vaguely butterfly-like silhouette. Cloudless Sulphur and Sleepy Orange butterflies find the shrub irresistible as both nectar source and larval host, and tend to arrive in numbers when the flowers open, a fact that either delights or mildly alarms a gardener, depending on how attached one is to the foliage. The caterpillars, for the record, are a vivid chartreuse and genuinely handsome. That is the bargain on offer.
'Buttercream' is a pale yellow-flowered form of Cassia bicapsularis, a softer, more refined take on that shrub's late-season show. Where the species blazes a saturated gold, 'Buttercream' carries clusters of cool, buttery cream-yellow flowers through autumn and into early winter, the same butterfly-like blooms at the ends of fast, arching branches, and the same draw for Cloudless Sulphur and Sleepy Orange butterflies that feed and breed on the plant.
September is a difficult month to write for. The garden is still technically in summer, but the light has shifted, lower and more golden, arriving at an angle that changes everything it touches. Cassia corymbosa reads that shift and answers it. While most summer shrubs are winding down, this one is only beginning, throwing dense corymbs of deep golden-yellow flowers at the branch tips with an enthusiasm that seems almost contrarian for the season.
Ceratostigma willmottianum, the Chinese plumbago, is a small deciduous subshrub grown for one of the truest blues in the garden. From midsummer into autumn the wiry, bristly-leaved stems carry clusters of intense cobalt-blue flowers, each a slim reddish-purple tube opening to five pale-blue lobes, and as the season cools the foliage turns a rich red and bronze, so that blue flower and crimson leaf often share the plant at once.
Cestrum elegans is an erect to arching shrub carrying dense terminal clusters of narrow tubular flowers in a deep crimson that reads as reddish purple in some lights. Bloom arrives late in the growing season and continues until frost, which is precisely when a border needs something, and the shape of those flowers tells you who they are for: hummingbirds work them relentlessly. In the tropics the plants build into a woody shrub of seven feet and more. In zone eight the top freezes off each winter and returns from the root the following spring, reaching three to six feet in a season, which makes this behave less like a shrub and more like a very large perennial.
Cestrum elegans var. smithii is the soft, blush-rose form of the elegant cestrum, a fast, arching shrub that carries dense terminal clusters of slender tubular flowers in a warm pink, mildly fragrant in the evening and a steady draw for hummingbirds. Where the species runs to hot red-purple, this variety keeps things gentler, blooming from late spring well into fall, and year-round under glass.
Few plants announce themselves the way Cestrum nocturnum does, and never by daylight. Through the afternoon the shrub keeps to a quiet, almost ordinary green, the slender branches arching and half-climbing, the small tubular flowers furled and unremarkable. Then dusk arrives, the cream-green trumpets open, and the night-blooming jasmine releases a perfume so far-reaching that it carries across a whole garden on still, warm air.
Leatherleaf is the quiet constant of the northern bog. Chamaedaphne calyculata, the only species in the genus, is a low, thicket-forming evergreen of the heath family that ranges right around the cold northern world, from the peatlands of North America east to the bogs of Finland and Japan, and southward in this country to the pocosins and acid bogs of the coastal plain, as far as South Carolina. Across that vast range, leatherleaf forms the dense, spreading colonies that hold a bog together and shelter the wildlife within.
Choisya is a small genus of aromatic evergreen shrubs from the southwestern United States and Mexico, kin to citrus in the rue family, and Choisya 'Aztec Pearl' is the garden world's favorite of the tribe. The hybrid, a cross between Choisya arizonica and Choisya ternata, was raised by Peter Moore at Longstock Park Nursery in England, and the selection has proved hardier, more heat tolerant, and altogether easier in the garden than either parent.
The rockroses bloom as if for a single day, and in a sense they do. Each papery flower of Cistus x purpureus lasts only from morning to evening before dropping, yet through late spring the shrub opens fresh bloom after fresh bloom, so the whole plant seems perpetually covered. The flowers are the draw: two to three inches wide, crushed-silk petals of pinky purple, each stamped at the base with a deep maroon blotch, a marking that earned the old garden name orchidspot rockrose. Rockroses are not roses, and are not related; the resemblance is only in the open, five-petalled face.
The Yuzuquat is a tri-generic hybrid, a curiosity even among unusual citrus. One parent is the yuzu, itself a cross of Citrus ichangensis and Citrus reticulata; the other is the 'Nagami' kumquat, Fortunella margarita. From that three-way pedigree comes an attractive evergreen citrus that bears sour, juicy, lemon-like fruits about the size of a chicken egg.
Citrus myrtifolia 'Chinotto' is the myrtle-leaf orange, a small, dense, thornless citrus grown as much for beauty as for fruit. The tidy branches carry little pointed leaves like a myrtle's, sweetly fragrant white flowers, and a long-held crop of small, round, bitter oranges. Compact and slow, the chinotto makes an exceptional container or patio plant, an evergreen jewel that flowers and fruits at an easy, manageable size.
NuClem is a special clementine among the cold-hardy citrus, a nucellar selection of the familiar clementine mandarin. Our friend and citrus guru Tom McClendon, who shared this one with us, explains it best: "NuClem is a nucellar Clementine, meaning that it comes true from seed. Most Clementines are polyembryonic, meaning that seeds will almost always produce hybrids with other citrus nearby. NuClem also is distinctive in its cold-hardiness, having proven reliably hardy in Montezuma, GA, making it probably on par with Satsuma. Fruit is globular, about two inches in diameter, with a mildly adherent peel more like an orange than a mandarin. Fruit quality is excellent."
The Meyer lemon is the great container citrus, beloved for thin-skinned, deep yellow-orange fruit that is sweeter and less acidic than a true lemon, and for fragrant, purple-tinged white flowers that come more than once a year. A small evergreen tree, the Meyer is thought to be a natural hybrid of lemon and some other citrus, probably a sweet orange or mandarin, which accounts for the mellow, almost floral flavor that has made the fruit a favorite of cooks.
Summersweet, or sweet pepperbush, is one of the most useful of the native shrubs for moist, shaded ground, and 'Hummingbird' is the compact, free-flowering selection that made the species a garden staple. Like the straight Clethra alnifolia, this is a stoloniferous deciduous shrub that forms colonies in moist, acid soil, valued above all for the upright spikes of intensely fragrant white flowers that perfume the whole garden in the heat of summer, when little else is blooming.
Clethra alnifolia, the summersweet or sweet pepperbush, is a deciduous native of the eastern United States, at home along pond edges, in damp woods, and at the margins of coastal swamps from Maine to Florida. The species spreads gently by suckers into colonies of upright stems, and earns the name sweet pepperbush from the small, peppercorn-like seed capsules that follow the flowers and hang on through winter. For all that, the summer flowers are the reason to grow them: erect bottlebrush spikes, intensely honey-scented, that open over many weeks in the heat of July and August when little else in the shrub border is in bloom.
Clinopodium coccineum is a small, aromatic, semi-evergreen subshrub of the mint family, native to the deep, well-drained sands of the southeastern coastal plain from Mississippi and Georgia down into Florida. The loose, open frame and small, spicy-scented leaves would earn a quiet place on their own, but the flowers are the event: scarlet tubes an inch or two long, held out like little trumpets. Bloom comes heaviest in spring and again in fall, with scattered flowers through the summer between, and in the mildest gardens of zones 8 and 9 the plant will open something in almost any month the weather stays soft.
‘Amber Blush’ is a soft-toned selection of the native scarlet calamint, Clinopodium coccineum, an aromatic, semi-evergreen subshrub of the mint family from the deep sands of the southeastern coastal plain. Where the wild species flowers in hot scarlet, this clone brings a gentler and more complicated color to the same tough, hummingbird-visited plant: bright yellow washed with orange, deepening toward amber.
Clinopodium georgianum is a low, aromatic shrublet of the mint family, grown for strongly scented foliage and clouds of soft pinkish-lavender flowers from late summer into fall, peaking around September when much of the garden is winding down. Where the scarlet calamint is a hummingbird firework, Georgia savory is the quiet one: smaller flowers, softer color, and a season that arrives when the bees have run short of options. Crushed, the leaves smell frankly minty, with a sweet edge that one nurseryman has compared to expensive peppermint candy.
