Plants that ask for water while they root, then fend for themselves. Chosen for gardens on sand, slope, or full baking sun, these are the tough, sun-loving plants that flower hardest in the heat and shrug off a dry August once established.
There is a book about Aucuba japonica called A Virgin for Eighty Years, which sounds like a romance novel and is, instead, one of the strangest stories in horticulture. The species arrived in England in 1783 as a single female plant. Aucuba is dioecious, male and female flowers on separate plants, so for the next eighty years every aucuba in English gardens was a clone of that one original female. Gardeners knew the plant was meant to bear bright red berries, since reports came back from Japan, but Japan had closed its borders, no male could be had, and they simply waited.
Carex flaccosperma, the blue wood sedge, is a clump-forming native of the Southeastern woodlands grown for cool, glaucous, blue to blue-green foliage. The blades are wide for a sedge, to half an inch, faintly quilted along the veins, and they catch the light with a soft powdery sheen that lifts a shaded planting where most greens recede.
Every grafted citrus tree is two plants pretending to be one: a familiar fruiting top, and a rootstock below the graft union doing the unglamorous work of roots, vigor, and disease resistance. US-1516 is one of the latter, and a good story all the same. The cross was made by the USDA in 1975, a pairing of opposites: African pummelo, the giant of the genus, crossed with Flying Dragon, the contorted, fiercely thorned, cold-hardy form of trifoliate orange (Poncirus trifoliata) that lends so many hardy citrus their backbone. The seedlings went into the ground at the Whitmore farm in Groveland, Florida in 1976 and then, in the patient way of tree breeding, were watched for forty years. Kim Bowman's program at the USDA lab in Fort Pierce released them at last in 2015, into the worst of the huanglongbing epidemic, the bacterial greening disease that has hollowed out Florida's groves. On infected ground they keep their grafted tops healthier and more productive than the old standbys. We offer them ungrafted, which is an unusual thing to sell and an honest one: this is a tree for the cold-hardy citrus tinkerer, the person who wants to practice budding, raise their own understock, or simply grow the trifoliate-blooded foundation and see how far north the plant will go. They come nearly true from seed, vigorous and uniform, and they ask only that you have plans for them. Graft them bold, or just let them teach you the lower half of the tree.
Clinopodium georgianum is a low, aromatic shrublet of the mint family, prized for highly scented foliage and clouds of pinkish-lavender flowers in late summer and fall, when much of the garden is winding down. Georgia savory makes a fine edging or front-of-border plant for sunny or lightly shaded spots with good drainage, and unlike most of the tribe, this southern native will grow in heavier soils as well as sand.
Few fruits carry the weight of centuries quite like the common fig. Ficus carica, native to the sun-soaked hills of the Mediterranean and the Middle East, has graced gardens and tables since biblical times, and no member of the tribe is more beloved in the American South than 'Celeste', the little fig so sweet that growers have long called the tree the Sugar Fig.
Hardiness
Zones 7–10
Light
Full Sun
Height
6–12 ft.
Spread
8–15 ft.
Plant type
Shrub
Traditional use
digestive health, topical applications, respiratory support
There is a small lie in the name. Sanguinea means blood, and yet the iris in front of you is blue, or blue running toward violet, with only a wine-dark deepening in the falls to argue the case. The botanists felt the strain too: Carl Thunberg first tried to file the plant as Iris orientalis in 1794, found that name already taken, and the species waited until 1813 for the one carried since. The Japanese never bothered with Latin. To them the flower is ayame, one of the three irises of early summer, threaded through a thousand years of poetry and arriving in that uncertain seam where the old poets could never quite agree whether spring had ended or summer begun.
Muhlenbergia dumosa, bamboo muhly, is a desert-born grass with the grace of bamboo, drifting like cloud shadow across the canyon floor. From the arid uplands and rocky washes of northern Mexico and southern Arizona, where sun-scorched cliffs and canyon walls shaped the character of the species, bamboo muhly evolved to thrive on dry air and lean soils, and yet carries the fluid elegance of true bamboo, swaying at the faintest breeze.
Myrcianthes fragrans is a member of the myrtle family native to the hammocks and coastal scrub of Florida and the Caribbean, the same botanical neighborhood as guava and allspice, which says something about the family character and the quality of the fragrance involved. Crush a leaf and the scent is immediate and specific: nutmeg with a citrus edge, clean and resinous in a way that makes the plant worth encountering even out of flower. The tiny, deep green leaves hold the aromatic oils responsible, and keep that quality year-round.
Oleander, Nerium oleander, is the great sun-loving evergreen of the Mediterranean, grown since antiquity for a long summer of bloom, with dark green, leathery, lance-shaped leaves in whorls of three along long, sparingly branched stems. 'Hardy Pink' is one of the cold-tougher selections, carrying showy, lightly fragrant clusters of clear rose-pink flowers from late spring well into fall.
Pistacia chinensis, the Chinese pistache, is a medium-sized deciduous tree and a close relative of the pistachio nut, though this species carries no crop for the table. What the tree offers instead is one of the finest autumn shows in the warm South: lustrous, dark green compound leaves that ignite, nearly all at once, into a fire of scarlet, orange, and red before they fall.
There is a small drama in this oak's name. It honors Benjamin Franklin Shumard, a physician turned geologist who became the first State Geologist of Texas and who, decades before the oil boom, noted petroleum seeping up at several spots across the state. The man who named the tree for him in 1860 was his own assistant, Samuel Buckley, who would later turn on Shumard in print, call him incompetent, and take the state geologist's post for himself, all of which makes the enduring courtesy of the name faintly delicious. The tree has outlasted the quarrel.
Rosemary is a timeless classic in both the garden and the kitchen, an aromatic evergreen shrub of the sun-baked Mediterranean coast, so distinctive that botanists long kept rosemary in a genus apart, Rosmarinus officinalis, before recent study moved the herb into the sages as Salvia rosmarinus. The old genus name means dew of the sea, for the plant's love of bright, salt-swept coastal hillsides. Slender, needle-like, deep green leaves clothe the woody stems the year round, and soft blue flowers open along them from winter into spring.
Hardiness
Zones 7–10
Light
Full Sun
Height
2–4 ft.
Spread
2–3 ft.
Bloom
Blue
Plant type
Shrub
Traditional use
digestive health, mental & emotional well-being, general wellness, topical applications
A graceful native onion, Allium cernuum, the nodding onion, lifts loose clusters of pink to lavender, bell-shaped flowers that bend over in a soft arc at the top of slender stems, swaying through mid and late summer above tufts of grassy, blue-green foliage. The nodding habit gives the plant a particular charm, and the flowers draw native bees, butterflies, and other pollinators in good numbers.
Hardiness
Zones 4–8
Light
Full Sun / Part Shade
Height
12–18 in.
Spread
6–8 in.
Bloom
Pink
Plant type
Perennial
Traditional use
respiratory support, digestive health, immune support
Flame acanthus, better known as hummingbird bush, is a tough, airy deciduous shrub for hot, dry places, hung from late spring until frost with slender orange to red tubular flowers that ruby-throated hummingbirds cannot resist. Small, pointed leaves give a light, open texture, and the long bloom season makes Anisacanthus wrightii one of the best hummingbird plants for the southern garden.
A pumpkin-orange selection of the classic flame acanthus, Anisacanthus wrightii 'Pumpkin' trades the usual scarlet for warm, glowing orange, lighting the late-season garden with the same slender, tubular, hummingbird flowers. The clone was discovered at the San Antonio Botanic Garden and is generally taken to be the selection known as 'Pumpkin'.
Baptisia alba, white wild indigo, is a striking native perennial of tall spires of white, pea-like flowers over deep blue-green foliage. Native to the eastern and central United States, the species carries a rich history as a dye plant, used by Native American peoples and early settlers as a substitute for true indigo, and the genus name, from the Greek bapto, to dip, records that role.
Buddleia alternifolia, the fountain or alternate-leaf butterfly bush, stands apart from the usual butterfly-bush crowd. A deciduous shrub native to northwestern China, the fountain butterfly bush is the most cold-hardy of the genus, and is grown above all for a weeping form and an early-season flood of fragrant, lavender-purple bloom.
A yellow-flowered butterfly bush, Buddleia x weyeriana 'Honeycomb' is a vigorous hybrid of Buddleia globosa and Buddleia davidii that the late Dr. Michael Dirr judged better than the older 'Sungold'. The plant came to Dirr from Crathes Castle Garden in Scotland, bought as the variety 'E.H. Wilson' but proving to be a very different and superior yellow butterfly bush, named 'Honeycomb' and a standout in Georgia trials, flowering as late as Thanksgiving.
Buddleja salviifolia, the sage-leaf butterfly bush, is a medium to large evergreen shrub from the sun-soaked hillsides of South Africa, and despite the exotic origin the plant has proven remarkably hardy in southeastern gardens, coming through winters at the University of Georgia's Athens trials with quiet resilience.
Hardiness
Zones 7–9
Light
Full Sun / Part Shade
Height
10–12 ft.
Spread
8–10 ft.
Bloom
Purple
Plant type
Shrub
Traditional use
respiratory support, digestive health, topical applications, general wellness
Calycanthus floridus 'Athens', also circulated under the name 'Katherine', is a yellow-flowered selection of the Eastern sweetshrub, a deciduous native of the Southeastern woodlands long grown for fragrance, adaptability, and strange, many-tepaled flowers. Where the wild plant blooms a deep maroon, 'Athens' opens soft, buttery yellow, an unexpected and elegant turn on a familiar shrub.
