The white-flowered form of swamp milkweed, Asclepias incarnata 'Ice Ballet' carries the same upright, well-mannered habit as the species but trades rosy pink for clusters of pure, cool white, held atop sturdy three-to-four-foot stems through summer. The effect is fresh and luminous in a moist border, and just as useful to wildlife.
Calycanthus 'Venus' is a white-flowered sweetshrub bred by Dr. Tom Ranney at North Carolina State University, drawing on three species at once: the Eastern Carolina allspice (Calycanthus floridus), the California sweetshrub (Calycanthus occidentalis), and the Chinese sweetshrub (Calycanthus chinensis, long known as Sinocalycanthus). The result is a deciduous shrub that carries the best of all three: hardiness, substance, and an unusual flower.
Born of careful hands and watchful eyes at the JC Raulston Arboretum in North Carolina, Calycanthus × raulstonii 'Hartlage Wine' is a sweetshrub of uncommon grace. Richard Hartlage made the cross as an undergraduate at North Carolina State University in 1991, pairing the Southern native Carolina allspice (Calycanthus floridus) with the refined Chinese sweetshrub (Calycanthus chinensis); the seedling first flowered in 1996, and the hybrid name honors J.C. Raulston, the arboretum's late director.
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.
Woodlanders has long led in offering citrus and citrus hybrids hardy well beyond the usual citrus belt, and the Morton citrange is a handsome one. Like other sweet orange and trifoliate orange crosses, Morton makes an attractive ornamental evergreen, with fragrant white spring flowers and orange fruit, but the fruit here sets the cultivar apart: large, smooth-skinned, and remarkably like a true orange, with very few seeds.
Summersweet, Clethra alnifolia, is one of the great fragrant natives of the eastern United States, a shrub of moist woods and pond edges whose white summer spikes carry a honey-and-clove perfume across the whole garden. Colonists called the plant Sweet Pepperbush, for the peppercorn-like seed heads that follow, and Summersweet, for the scent; the flowers even lather softly in water and once served as a field soap.
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: showy scarlet tubes carried over a long summer season, held out like little trumpets that hummingbirds cannot resist.
Lindera megaphylla is a plant for the patient collector, a broad-leaved evergreen of real presence and pedigree that reveals itself over seasons rather than days. The species comes from the mist-laden mountain forests of western China, where the shrub grows in dappled light among rhododendrons and ancient oaks. Sir Harold Hillier, the great British plantsman, first shared this rarity with Western gardens in the 1970s from his famous nursery, and even now the Chinese spicebush remains uncommon in cultivation.
Manfreda maculosa carries the rugged beauty of the American Southwest into the garden. Known by a string of evocative names, Texas tuberose, spice lily, and rattlesnake agave, this striking plant hails from the arid country of Texas and northern Mexico, where the spotted leaves and tall, aromatic flower stalks have caught the eye of gardeners and naturalists for generations.
Monarda fistulosa, wild bergamot, is one of the great native perennials of the North American prairie, a hardy, aromatic member of the mint family loved for showy heads of lavender-pink and for a fragrance like oregano crossed with mint. The species grows wild in meadows, prairies, and open woods across most of the continent, and brings both vivid summer color and a deep well of history to the garden.
Nerium oleander has been grown around the Mediterranean since antiquity, the name Nerium drawn from the Greek neros, watery, for the streamsides where the shrub grows wild. 'Variegata' brings that ancient toughness together with luminous foliage: narrow, leathery leaves edged in creamy white around a deep green center, held in whorls along the stems so the whole shrub seems lightly frosted even when out of flower.
'Variegatus' brings light to the false holly. The spiny, holly-like evergreen leaves are edged in clean creamy white against a dark green center, so the whole shrub reads as a soft glow at a distance and a crisp, formal pattern up close. The variegation lifts a shaded corner the year round, a quiet luminance that the plain green species cannot offer.
Osmanthus suavis is the mountain member of the sweet olive family, a shrub of quiet, upright grace carried down from high ground. Native to the cool slopes of the eastern Himalayas and the misted forests of southwest China, the plant has the unhurried resilience of alpine flora, and the narrow, pointed, finely toothed leaves, darkly lustrous and neatly held, give a formal, upright presence the year round.
Ptelea trifoliata, the hop tree or wafer ash, is a unique and underappreciated native, a small, bushy deciduous tree of eastern and central North America. Highly adaptable, the plant takes dry, rocky ground as readily as moist, well-drained sites, which makes the hop tree a fine choice for naturalized landscapes, pollinator gardens, and woodland edges.
