Wisteria floribunda (Willd.) DC.
Pea family (Fabaceae)
Japanese wisteria was introduced to the U.S. in 1830. It has been widely planted and cultivated and is still very popular in the nursery trade despite its weedy and destructive habits. It is probably frequently misidentified as Chinese wisteria.
Distribution and Habitat
Japanese wisteria is found invasive in the mid-Atlantic and southeastern U.S., from New York to Florida and west to Texas. Wisteria prefers full sun, but established vines will persist and reproduce in partial shade. Vines climb trees, shrubs and manmade structures. It is tolerant of a variety of soil and moisture regimes but prefers deep, loamy, well drained soils. Infestations are commonly found along forest edges, roadsides, ditches, and rights-of-way.
The hard woody vines twine tightly around host tree trunks and branches and cut through bark, causing death by girdling. On the ground, new vines germinating from seed or sprouting from rootstocks form dense thickets that smother and shade out native vegetation and impede natural plant community development. As girdled trees die, canopy gaps are created which increase the amount of sunlight reaching the forest floor. While this may temporarily favor some native species, it also stimulates vigorous growth and further spread of wisteria.
Description and Biology
Prevention and Control
For small infestations, cut vines to relieve trees of the weight and girdling; treat cut stems with a systemic herbicide containing glyphosate or triclopyr; new plants will grow from seed; long term management is needed (see Control Options).
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