The plants that come back. Herbaceous perennials rise from the crown each spring, flower through the warm months, and retreat to the ground in winter, returning larger the year after. They are the flowering heart of the border, the long-term investment that repays a gardener season after season.
Salvia uliginosa, the bog sage, is an airy, sky-blue perennial grown for clouds of clear, cool blue flowers held on tall, slender, branching stems from midsummer into fall. The species name uliginosa means of marshes, and the plant lives up to it, thriving in the moist ground most sages refuse, so the bog sage fills a niche few others in the genus can.
Salvia urticifolia, the nettleleaf sage, is an uncommon herbaceous perennial native to the Appalachians and the wider Southeast, grown for cool blue-to-violet flowers set off by a pair of white marks in the throat. The bloom comes in the freshness of mid to late spring, the flowers hovering above serrated, nettle-like leaves, and in a generous year a lighter second flush may follow in late summer.
Royal catchfly wears the most electric red in the native flora. Silene regia sends up leafy, upright stems two to four feet tall, topped in mid to late summer with loose clusters of brilliant scarlet, star-shaped flowers, each with five deeply notched petals. Few prairie plants flower in true red, and fewer hold that color through the heat of July and August, which makes this native a genuine standout.
Cup plant is a giant of the summer prairie, a statuesque perennial that rises on stout, square stems to eight feet or more and lifts a crown of bright yellow, daisy-like flowers above the border. The name comes from a quirk of the foliage: the large, coarse leaves are perfoliate, joined in pairs around the stem to form a shallow cup that catches and holds rainwater. Silphium perfoliatum belongs to the sunflower tribe of the aster family, Asteraceae, and shares that clan's generosity of bloom.
Hardiness
Zones 4–8
Light
Full Sun / Part Shade
Height
4–8 ft.
Spread
2–3 ft.
Bloom
Yellow
Plant type
Perennial
Traditional use
detoxification & cleansing, respiratory support, pain relief, digestive health
Blue-stemmed goldenrod is the goldenrod for shade. Where most of the clan demand open sun, Solidago caesia threads through the dappled light of the eastern woodland, arching slender, blue-purple stems that carry small, brilliant yellow flowers packed into the leaf axils, so the bloom runs the whole length of each stem like a garland. That habit gives the second common name, wreath goldenrod, and the late-summer to autumn color arrives just as the shade garden begins to fade.
In the open oak-hickory woodlands and fire-maintained savannas that once covered the upland South, Georgia aster was a fixture, a late-season native sending up violet-blue flowers in October and November at the precise moment when almost everything else had finished. That landscape is largely gone now, and the aster went with most of it.
A native aster with a regional accent. Most of the asters Americans plant are wide-ranging species that turn up from Maine to Texas and read essentially the same wherever they grow. Symphyotrichum grandiflorum is more particular, with a native range small and specific: the Atlantic Coastal Plain of Virginia and the Carolinas, plus the Piedmont of the Carolinas, and little more. A few hundred miles of sandy roadsides, dry pine-oak woods, abandoned fields, and forest edges from the Tidewater into the rolling country west of the fall line. For a gardener in the Carolinas or Georgia, this is one of the few asters that is genuinely here, a piece of the actual Atlantic Coastal Plain flora rather than a borrowed prairie species filling in for a missing native.
Copper Canyon daisy is a big, aromatic, autumn-flowering marigold from the mountains of southern Arizona and adjacent northern Mexico, grown as much for the scent as the show. Brush against the finely divided, fern-like foliage and the plant releases a strong, distinctive fragrance, a mix of citrus, anise, and marigold that some find intoxicating and others frankly pungent. Tagetes lemmonii builds a soft, shrubby mound three to four feet high and wider still.
Tagetes lucida is the herb that does it all. Known as Mexican tarragon, Mexican mint marigold, pericón, and, in the old Aztec tongue, yauhtli, this fragrant perennial from Mexico and Central America earns every name. The narrow, glossy, deep-green leaves carry a warm anise-tarragon scent and flavor, and in late summer and fall the plant scatters small, single, golden-yellow marigold flowers across a tidy foot-and-a-half mound.
Tulbaghia violacea, the plant gardeners know as society garlic, is a clump-forming perennial from the summer-dry grasslands of southern Africa, ranging from the Little Karoo through the Eastern Cape to KwaZulu-Natal. The genus honors Ryk Tulbagh, the eighteenth-century Dutch governor of the Cape of Good Hope, while the species name violacea simply means violet, for the color of the flowers. The common name is a small joke: the leaves carry a clear garlic scent, but a gentler, more sociable one than true garlic, said to be polite enough for company.
Hardiness
Zones 7–10
Light
Full Sun / Part Shade
Height
1–2 ft.
Spread
1–2 ft.
Bloom
Purple
Plant type
Perennial
Traditional use
respiratory support, digestive health, immune support
'Homestead Purple' is one of the great garden discoveries of the modern South, a trailing perennial verbena found not in a breeding plot but by the side of a Georgia road. In the early 1990s the University of Georgia horticulturists Michael Dirr and Allan Armitage drove past a sheet of royal-purple bloom at an old homestead, turned around, and gathered cuttings from a plant the owner said had simply grown there for years. That roadside find became one of the most popular perennials in American gardens, and the botanists gave the plant the name of the place it was found.
A native violet grown as much for the leaf as the flower. Viola walteri, Walter's violet, belongs to the violet family, Violaceae, and honors the British-born botanist Thomas Walter, whose Flora Caroliniana of 1788 was the first flora of the American Southeast. The prostrate blue violet ranges in the wild from Texas east to Florida and north to Virginia and Ohio, threading the floors of moist deciduous woodlands and shaded rocky ledges.
