|A young Concord grapevine|
Vitis labrusca (Fox grape) is a species of grapevines belonging to the Vitis genus in the flowering plant family Vitaceae. The vines are native to the eastern United States and are the source of many grape cultivars, including Catawba and Concord grapes, and many hybrid grape varieties such as Agawam, Alexander and Onaka. Among the characteristics of this vine species in contrast to the European wine grape Vitis vinifera are its "slip-skin" that allows the skin of the grape berries to easily slip off when squeezed, instead of crushing the pulp, and the presence of tendrils on every node of the cane. Another contrast with European vinifera is the characteristic "foxy" musk of V. labrusca, best known to most people through the Concord grape. This musk is not related to the fox animal, but rather the earthy, redolent aromas characteristics of the grapes that were known by early American settlers to the New World. The term "foxy" became a sort of catchall for the wine tasting descriptors used for these American wines that were distinct from the familiar flavors of the European vinifera based wines.
According to wine historian Edward Hyams and wine expert Jancis Robinson, Vitis labrusca was likely the species spotted by Leif Ericsson growing wild along the coast of Vinland in the 11th century. There is ample evidence that the labrusca was growing wild in North America centuries before the Europeans discovered the continent. However, the vine was not officially identified and recorded until Carl Linnaeus and his peers started cataloging American vine species in the mid 18th century. In the 19th century, Vitis labrusca was among the American vines transported to Europe that were carrying the phylloxera louse which would cause wide spread devastation to the European vineyards planted with Vitis vinifera.
Also in the 19th century, Ephraim Bull of Concord, Massachusetts, cultivated seeds from wild labrusca vines to create the Concord grape which would become an important agricultural crop in the United States.
Vine characteristics 
The majority of Vitis labrusca grape varieties are red (though white varieties such as Niagara and "pink-skinned" varieties such as Catawaba exist), with dark colored berries high in phenolic compounds that produced strongly flavored wines. As the berries near harvest and become fully ripe, they separate easily from the pedicel (berry stem). If the berry is squeezed gently between two fingers, the thick skin will slip easily off leaving the pulp intact as a ball. This trait gives Vitis labrusca the name of "slip skin" grapes. Another trait of labrusca that aids ampelographers in identification of vines and hybrid varieties descended from the species is the large, thick leaves of the vines that have a hairy underside with dense brown or white hairs.
Like many other American vine species, Vitis labrusca has some natural resistance to many grape diseases, including phylloxera. However, its resistance and grafting compatibility is not as high as other species, such as Vitis aestivalis, Vitis rupestris and Vitis berlandieri, and is not often used for commercial rootstock.
Wine regions 
Vitis labrusca can be found along the eastern seaboard of North America from Nova Scotia down to Georgia and westward to the Mississippi river. Among the Canadian wine regions and American Viticultural Areas (AVA)s that produce wine from labrusca or hybrids derived from labrusca include Ontario, Upper Mississippi Valley, Mississippi Delta, Ohio River Valley, Southeastern New England, Lake Erie as well as several AVAs in the states of New York, Virginia, Ohio and Michigan.
Unlike vinifera, hybrids and Vitis labrusca varieties can better withstand the severe continental conditions of eastern North America with severely cold winters and hot, humid summers. (However, labrusca doesn't do quite as well as varieties like Vitis rotundifolia in the humidity of southeastern US). In fact, in areas of the United States where vinifera does flourish in the west, the conditions during the growing season are often too arid for labrusca vines.
"Foxy" musk 
According to University of California, Davis viticulture expert A. J. Winkler, outside of the vinifera Muscat family of grapes, Vitis labrusca varieties have the most pronounced aromas among wine grape varieties. The description of "foxy" doesn't have anything to do with actual animal, but rather serves as a catch-all term to describe the unique, earthy and sweet muskiness that is best epitomized by fresh Concord grapes though some of the "sweet muskiness" can be perceived in grape juice made from Concord and other labrusca varieties like Niagara. In the 1920s, scientists were able to isolate the aroma compound responsible for the "foxy" musk as methyl anthranilate.
Notable varieties 
- Concord - largest cultivar, estimated at 80% of labrusca production
See also 
- J. Robinson (ed) "The Oxford Companion to Wine" Third Edition pg 19-20 Oxford University Press 2006 ISBN 0-19-860990-6
- B. Ramey The Great Wine Grapes Concord, Catawaba and Delaware entries (no page numbers in book) University of California-Davis, 1977 ASIN B0006CZP4S
- J. Robinson Vines, Grapes & Wines pg 8, 18, 228 Mitchell Beazley 1986 ISBN 1-85732-999-6
- Winkler AJ, Cook JA, Kliere WM and Lider LA General Viticulture (2nd ed.) pg 17-20, 59, 166-167 University of California Press. 1974 ISBN 0-520-02591-1.
|Wikimedia Commons has media related to: Vitis labrusca|
- Vitis labrusca at the PLANTS national database - Includes map of natural habitat