The tropics, grown against the odds. Sub-tropicals bring bold leaves, vivid flowers, and a whiff of the jungle to gardens well north of the frost line, thriving through a hot Southern summer and, with a little shelter, holding on through the cold.
Two things the common names get wrong: it is not Chinese, and it is not a maple. Abutilon pictum comes from the warm river country of southern Brazil and its neighbors, Argentina, Paraguay, and Uruguay, and the maple lives only in the leaves, which are lobed and toothed enough to have fooled people into "flowering maple." It belongs instead to the mallow family, in good company with hibiscus, hollyhock, okra, and cotton, and it carries that resemblance in every five-petaled bloom.
Call it a flowering maple if you like, but there is not a drop of maple in it. Abutilon pictum belongs to the mallow family, alongside hibiscus, hollyhock, okra, and cotton, and only the lobed, maple-shaped leaves account for the nickname. What the leaves of 'Souvenir de Bonn' actually do is carry a wide, irregular margin of cream around their green, a variegation bold enough to earn the plant its place on looks alone. The flowers settle the matter. All season they dangle from the branches like small paper lanterns, apricot to salmon, each bell veined through with crimson, swinging on thin stalks where the hummingbirds find them. 'Souvenir de Bonn' is among the oldest abutilons still in gardens, a parlor plant out of the conservatory age, when a variegated flowering maple was the sort of thing one kept in a bright room through winter and carried out to the terrace each summer. The species hails from Brazil; the cultivar name is a keepsake of Bonn, a souvenir that outlasted whoever first carried it home. They are tender, frost being their one real enemy, and in our climate they may sail through a mild winter outdoors or die to the ground and return from the root. Either way they earn their keep, blooming spring to frost and beyond, asking only for sun, rich soil, and water enough to keep the show going. Set them where you pass close, on a patio or against a warm wall, where the lanterns can be read at eye level.
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.
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.
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.
True cardamom, Elettaria cardamomum, is a lush, aromatic member of the ginger family and the source of green cardamom, the ancient and costly spice traded for millennia along the Silk Road and across the Indian Ocean. Native to the humid, evergreen hill forests of southern India and Sri Lanka, the plant grows in the dappled shade of the understory, in deep, fertile, always-moist soil. Ranked historically among the most valuable spices in the world, cardamom carries a history as rich as the flavor.
Hardiness
Zones 8–10
Light
Part Shade / Full Shade
Height
6–12 ft.
Spread
3–6 ft.
Bloom
White
Plant type
Perennial
Traditional use
digestive health, respiratory support, general wellness
The limequat was born of catastrophe. After the twin freezes of 1894 and 1895 laid waste to Florida's groves, Walter T. Swingle of the United States Department of Agriculture set out to breed citrus that could shrug off a cold snap, and in 1909 he crossed the sharp little West Indian or Key lime (Citrus aurantifolia) with the round Marumi kumquat (Fortunella japonica). Named and introduced in 1913 alongside a sister seedling called Lakeland, the Eustis limequat stands among the first successful intergeneric citrus hybrids, living proof that two separate genera could be wedded and still bear generous fruit.
Firebush earns the name honestly. From late spring until the first frost, the arching branch tips carry tight clusters of slender tubular flowers in hot orange-red, each one a narrow torch held out for the hummingbirds and butterflies that work the plant from morning to dusk. The foliage plays along: new leaves and stems flush bronze to burgundy, the veins stained red, so that even between flushes of bloom the whole shrub reads warm. Few plants pull in as much winged traffic through the heat of a southern summer.
This is the uncommon pink-flowered Turk's cap, a soft-toned form of the familiar scarlet Malvaviscus arboreus, a subtropical relative of the hibiscus in the mallow family, Malvaceae. The flowers carry the same charming quirk as the red kind: two to three inches long, they never open flat like a hibiscus but stay furled in a little turban, glowing here in clear pink rather than red.
Malvaviscus drummondii is the small Turk's cap, the wild, native cousin of the larger Mexican wax mallow and, for many Southern gardeners, the better plant of the two. A relative of the hibiscus in the mallow family, Malvaceae, this shrubby perennial is native to Texas, the Gulf Coast states, and on south, and grows wild in the dappled shade of woodland edges and stream banks where few other bright flowers will bloom.
'Pam Puryear' is the soft-pink small Turk's cap, a lovely departure from the usual fire-engine red of this tough native mallow. The furled, never-quite-open flowers keep the charming Turk's cap form, less than two inches long and produced without pause through the hot months, but here they glow a gentle shell pink that reads cool and quiet in the summer border.
The Sunquat began as an accident in a Beeville, Texas dooryard in the early 1940s, when a man named Leslie Cude noticed a seedling carrying fruit that looked like a small lemon and behaved like a kumquat. Walter Swingle, the great citrus authority of the day, took one look and guessed a cross of Meyer lemon and kumquat, which is where the name Lemonquat comes from and how it entered the collections as Citrus limon × Fortunella. The trouble is that the curators who have kept the tree at Riverside ever since have come to doubt him. The fruit, they think, points to a mandarin somewhere in the parentage rather than a lemon, which would make the plant a mandarinquat wearing the wrong label. Nobody has settled the question. The plant has gone out as Sunquat, Lemonquat, Lemondrop, and Marmaladequat, four names for one tree, each a different theory and not one of them proven. Asking a citrus to hold still long enough to be classified rather misunderstands the family.
Woodlanders has long been a leader in offering citrus and citrus hybrids hardy well beyond the usual citrus belt, and the 'Razzlequat' is one of the odder and hardier of the lot. The plant is a cross between the Australian desert lime, Eremocitrus glauca, a tough, drought- and cold-tolerant native of the arid Australian interior, and, most likely, the familiar 'Meyer' lemon. From the desert lime parent come thorny, wiry branches, small narrow gray-green leaves, and a hardiness and drought tolerance rare among citrus; from the lemon come size and flavor.
A cold-hardy citrus with a Woodlanders pedigree. Woodlanders has long led in offering citrus and citrus hybrids that stand outdoors beyond the usual citrus belt, and the calamandarin is one of the toughest. Likely a hybrid of a mandarin, Citrus reticulata, and a calamondin, the calamandarin blends easy-peeling, tangerine-like fruit with the cold tolerance that calamondin brings to the cross.
The Ponderosa lemon is grown for spectacle as much as for the kitchen. The fruits are enormous, often two to four pounds each, thick-skinned and gloriously bumpy, hanging like green-gold cannonballs among the glossy leaves. For all the size, the flesh is tart, juicy, and true lemon in flavor, and works in any recipe a regular lemon would, with the novelty of a single fruit that can fill a hand.
The Rangpur is not truly a lime at all, but Indian gardeners have used the fruit as one for more than five hundred years. Citrus x limonia, an old natural hybrid of mandarin and citron, bears small, round, deep orange fruits that look like tangerines and taste fiercely sour, with the aromatic bite that makes a fine lime substitute for cooking, cocktails, and marmalade. In India the fruit goes by surkh nimboo, the red lime, prized for exactly that intense, tart juice.
Among the very first of the citranges, Citrus 'Rusk' dates to 1897, when Walter Swingle crossed a Ruby orange with the tough, cold-hardy trifoliate orange, Poncirus trifoliata, in the great effort to breed citrus that could take a freeze. The result is a vigorous, tall-growing, notably hardy tree, evergreen to semi-evergreen, and dense with the distinctive three-parted trifoliate leaves.
