Cold-hardy citrus for gardeners who thought they could not grow their own. Selected to take a real Southern winter, these are the lemons, mandarins, and kumquats that fruit outdoors where tender citrus would fail, many of them reliable in Zone 8 with no more shelter than a warm wall.
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.
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.
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.
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.
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.
Named for Walter Tennyson Swingle, the pioneering citrus breeder who spent his career crossing tender oranges with the iron-hardy trifoliate orange, the Swingle citrumelo is among the toughest citrus hybrids ever raised. A cross of grapefruit, Citrus paradisi, and trifoliate orange, Poncirus trifoliata, this vigorous, thorny, semi-evergreen shrub or small tree carries fragrant white citrus blossoms in spring, followed by pear-shaped yellow fruits about the size of a large orange.
Woodlanders has long led in offering citrus and citrus hybrids hardy well beyond the usual citrus belt, and the Troyer citrange is a classic of the kind. A cross of the Washington navel orange and the inedible but iron-hardy trifoliate orange, Poncirus trifoliata, the Troyer was raised in 1909 under the direction of the great citrus breeder Walter Swingle, and later named for A. M. Troyer of Fairhope, Alabama, where the tree first bore fruit, a nice southern footnote for a hardy citrus.
Woodlanders has long led in offering citrus and citrus hybrids hardy well beyond the usual citrus belt, and U.S. 119 is one of the most refined of the group. A complex USDA hybrid, a citrumelo crossed back with a sweet orange, the tree runs one quarter trifoliate orange, one quarter grapefruit, and one half sweet orange, a pedigree chosen to keep the toughness of the trifoliate while pushing the fruit toward genuine quality.
US-942 began life as a rootstock, bred by the USDA and released in 2010 after years of Florida field trials, a careful cross of the Sunki mandarin and the curious Flying Dragon form of trifoliate orange, Poncirus trifoliata. As a rootstock the record is stellar: compact, productive trees, strong resistance to Phytophthora and tristeza virus, and better tolerance of citrus greening than most, which is why growers across the citrus belt have come to trust the number.
The sour orange is grown across the warm world as an ornamental and even a street tree, and stands somewhat naturalized in Florida. The fruit is famous for marmalade and useful little else, since the flesh is fiercely sour and bitter, not for eating out of hand. This particular unnamed selection has a Woodlanders story: we propagated the tree from a single specimen found growing on the edge of an abandoned sandy field in a remote corner of Appling County, Georgia, with no house anywhere near. What drew us was the crop, abundant, large, and very showy, loose-skinned and easy to peel.
Among the more intriguing fruits in the Woodlanders citrus collection, the Gou Tou sour orange stands apart, not only for rarity but for a rare combination of hardiness, heavy fruiting, and surprisingly pleasant flavor. Widely cultivated in Southeast Asia, Citrus aurantium 'Gou Tou' carries the form of a traditional bitter orange but with a taste that leans toward grapefruit, which makes this one of the most palatable sour oranges a gardener outside the subtropics can grow.
The Yuzuquat is a tri-generic hybrid, a curiosity even among unusual citrus. One parent is the yuzu, itself a cross of Citrus ichangensis and Citrus reticulata; the other is the 'Nagami' kumquat, Fortunella margarita. From that three-way pedigree comes an attractive evergreen citrus that bears sour, juicy, lemon-like fruits about the size of a chicken egg.
NuClem is a special clementine among the cold-hardy citrus, a nucellar selection of the familiar clementine mandarin. Our friend and citrus guru Tom McClendon, who shared this one with us, explains it best: "NuClem is a nucellar Clementine, meaning that it comes true from seed. Most Clementines are polyembryonic, meaning that seeds will almost always produce hybrids with other citrus nearby. NuClem also is distinctive in its cold-hardiness, having proven reliably hardy in Montezuma, GA, making it probably on par with Satsuma. Fruit is globular, about two inches in diameter, with a mildly adherent peel more like an orange than a mandarin. Fruit quality is excellent."
The Meyer lemon is the great container citrus, beloved for thin-skinned, deep yellow-orange fruit that is sweeter and less acidic than a true lemon, and for fragrant, purple-tinged white flowers that come more than once a year. A small evergreen tree, the Meyer is thought to be a natural hybrid of lemon and some other citrus, probably a sweet orange or mandarin, which accounts for the mellow, almost floral flavor that has made the fruit a favorite of cooks.
Woodlanders has long led the way in offering cold-hardy citrus, the kinds that carry fruit well beyond the usual citrus belt, and Ichang Lemon is a favorite of the group. The plant grows as a medium, evergreen small tree with large leaves on winged petioles and thorny branches, opens the fragrant white flowers typical of citrus in spring, and follows with very large, lemon-yellow, fragrant fruit.
The Indio mandarinquat is one of those happy accidents that citrus breeding throws up now and then, a natural cross between a mandarin (Citrus reticulata) and a kumquat (Citrus japonica) that borrows the best of both parents. From the mandarin come the size, the deep orange color, and the perfume; from the kumquat come the sweet, tender, wholly edible rind and a welcome measure of cold tolerance. The fruits hang like small golden lanterns against dark evergreen leaves through winter, oblong and glossy, and the whole tree carries a poise that belies how easy the plant is to grow.
