Plants that turn their faces to the light. This is the roll call for the open, sun-struck parts of the garden, the borders and banks that bake from morning to evening, where the toughest, brightest, most floriferous plants do their best work.
Sourced originally from the noted citrus enthusiast Tom McClendon, Citrumelo 'Dallas' is a cold-hardy hybrid between the rugged trifoliate orange, Poncirus trifoliata, and a grapefruit. From that unlikely pairing comes a vigorous small tree that carries the trifoliate's toughness and a good measure of grapefruit character in the fruit.
Citrumelo 'Dunstan' is a hardy heirloom hybrid of the rugged trifoliate orange, Citrus trifoliata, and the sunlit grapefruit, Citrus paradisi, and from that unlikely marriage comes a fruit and tree of real merit. The golden-yellow globes swell to nearly four inches across, fragrant, and, touched with sugar, carry the tart refreshment of a grapefruit picked a little shy of ripe. Here is fruit both rustic and refined, bred for survival yet still hinting at the orchard.
A very old Chinese cultivar, almost certainly named for the capital of Hunan province where the fruit has been grown for centuries, and quite possibly carrying C. ichangensis somewhere in the parentage. That suspected ancestry would account for the cold tolerance that has made Changsha the parent stock for nearly every modern hardy citrus breeding program of consequence: Wayne Hanna's seedless work at UGA Tifton, the Arctic Frost satsuma cross out of Texas, and others still in trial.
Woodlanders has long led in offering citrus and citrus hybrids hardy well beyond the usual citrus belt, and the Keraji mandarin is a favorite of the group. A medium-sized evergreen tree with the usual fragrant white citrus flowers, Keraji follows them with what Tom McClendon, in Hardy Citrus for the Southeast, calls "small, yellow, flattened tangerines that have a sweet lemonade taste unlike any other citrus fruits." That flavor is the whole reason to grow the tree, and Keraji has proven quite hardy in Augusta, Georgia since 1997.
Woodlanders has long led in offering citrus and citrus hybrids hardy well beyond the usual citrus belt, and Citrus taiwanica is one of the tougher evergreens of the group. A vigorous, upright, spreading, thorny tree, the Taiwan orange bears sour tangerine-to-orange fruit that is both ornamental and useful, the base of a very tasty ade. One of the hardier evergreen citrus, the tree sets good crops here in Aiken, South Carolina.
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.
A native of China, Korea, Japan, Taiwan, and parts of South Asia, Clerodendrum trichotomum has been cultivated in Western gardens since the mid-1800s, when the shrub was introduced from Japan and quickly adopted across Europe and the American South for uncanny late-season performance. This is the hardiest member of the genus and, for our money, the most theatrical.
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 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.
'Desi Arnez' (Clinopodium georgianum hybrid) turned up as a chance seedling in the garden of Robert Mackintosh, a cross of uncertain parentage that Woodlanders judged worth keeping and worth introducing. The likeliest account is a quiet romance between Georgia savory (Clinopodium georgianum) and a neighboring false rosemary (Conradina), two southeastern natives that seldom bother to cross the line between their genera. Botanists who keep their Latin tidy now file the result under the bigeneric name ×Clinadina, which is roughly how the field admits it never saw the match coming.
Among the most bewitching sights in the summer garden, Colocasia esculenta 'Black Magic' rises like a gothic dream from the soil, the velvety, purple-black leaves casting deep shade and deeper admiration. Sometimes called the Jet Black Wonder, this dramatic taro cultivar has become a garden sensation across the South, beloved for bold color and architectural form.
This one comes with a paper trail. 'Illustris' was first described in 1873 by William Bull, the Chelsea nurseryman, who listed the plant as Alocasia illustris in his catalogue of new and rare plants and sold them out of his glasshouses at 536 King's Road. Nobody knows quite where they came from. Colocasia esculenta is a restless, variable species, and Bull had rivers of tropical material moving through the place, so the likeliest story is that he caught a dark-leaved sport among the green, liked what he saw, and kept dividing the stock. Every 'Illustris' in cultivation descends from that one Victorian decision. A 150-year-old clone, still in production.
Conradina canescens 'Gray Mound' is a silver-leaved selection of the false rosemary that grows wild on the deep, pine-fringed sands of the northern Gulf Coast, in Alabama, Mississippi, and the Florida panhandle, where the species once mingled with sea oats and longleaf pine. A member of the mint family, this aromatic shrub carries soft, needle-like foliage in a ghostly silver-gray, and from spring into early summer, sometimes again in the cool of fall, offers a flush of pale lavender to bluish, two-lipped flowers that native bees and butterflies work eagerly.
This is a tree you harvest from a boat. Crataegus opaca, the western mayhaw, grows wild in the flooded bottoms of the Gulf Coastal Plain, the cypress sloughs and pond margins of east Texas, Louisiana, and the Deep South, and when their fruit ripens in late spring it drops straight into the water and floats. For generations Southern families went out in May with boats, nets, and scoops to gather the bobbing red haws off the surface, a fast three weeks of work that turned into a year's worth of jelly. The name says as much: mayhaw, for the month, and haw, the old word for hawthorn.
Japanese cedar is a tall, pyramidal to conical evergreen conifer, and the great timber tree of Japan, where the sugi soars past a hundred feet and lines temple avenues and mountain forests alike. The blue-green needles are held close and awl-shaped, taking on a bronzy, purple-bronze cast through cold winters before recovering their color in spring. The reddish-brown bark peels in long fibrous strips down a straight, buttressed trunk.
The genus name comes from the Greek dichroos, meaning "two-colored," and Dichroa versicolor presses the idea further: bloom color shifts with soil chemistry much the way a hydrangea does, swinging from deep cobalt to soft mauve depending on how much aluminum a plant can draw up. The species epithet versicolor only doubles down on the point, promising a shrub that refuses to settle on a single shade.
Distylium myricoides belongs to the witch-hazel family, Hamamelidaceae, an evergreen cousin of the fragrant winter witch-hazels, though the kinship shows in the flowers rather than the leaves. The Piroche form is a distinct, low-slung selection of the species, chosen for a broad, spreading habit and strong horizontal branching that make the plant read more as living groundwork than as an upright shrub.
Golden dewdrop, Duranta erecta, is a member of the verbena family grown across the warm world for two ornaments the shrub carries at once: loose, drooping sprays of soft lilac-blue flowers, each with a darker eye, and long chains of round, glossy amber berries that hang like strings of wet gold. The common name catches that second gift exactly, while older names, pigeon berry and skyflower, catch the first. Native from Mexico and the Caribbean through much of tropical South America, the shrub has been carried into gardens throughout the subtropics, where the plant flowers and fruits nearly year round.
Duranta serratifolia, the tala blanco of northern Argentina, is a South American cousin of the familiar golden dewdrop and belongs, like all Duranta, to the verbena family. The species epithet serratifolia means saw-toothed leaf, for the finely serrated margins that separate this plant from the smoother-leaved dewdrops. In the wild the shrub grows through the dry forests and thorn scrub of the Argentine northwest, where the common name, roughly white tala, sets the plant among the talas, the spiny native trees and shrubs that give those woodlands their character.
Erythrina × bidwillii is one of the great show-stoppers among the coral beans, a bold hybrid between the Argentine cockspur coral tree, Erythrina crista-galli, and the southeastern native coral bean, Erythrina herbacea. From that crossing comes a plant with the size and drama of the South American parent and the toughness of the North American one, throwing long spikes of vivid, tubular scarlet flowers through the summer, far larger and more sustained than either parent alone.
