American Wisteria Tree

American wisteria is a deciduous, twining woody vine with compound green leaves and fragrant, hanging clusters of pea-shaped flowers. Its twining stems need sturdy support and regular pruning to maintain the framework. The flowers are usually lilac-purple or blue, though white-flowered forms also occur. ## Growing Conditions Give it full sun for the strongest flowering; partial shade is tolerated. Plant in moist, well-drained soil with humus and slightly acidic pH. The species grows in clay and loam, and NC State lists heat, drought and soil-compaction tolerance. It is hardy in USDA zones 5a–9b. [NC State Extension's species profile](https://plants.ces.ncsu.edu/plants/wisteria-frutescens/) provides the detailed care and habitat notes. ## Garden Use Train the twining stems over a sturdy arbor, trellis, fence or wall, or maintain a trained tree form with a strong support. American wisteria is native to North America and is less aggressive than Chinese wisteria, though its mature stems can still become long and heavy. Fragrant blooms appear mainly in spring, with limited additional summer bloom possible. [The Morton Arboretum's American wisteria profile](https://mortonarb.org/plant-and-protect/trees-and-plants/american-wisteria/) describes its growth, support needs and flower clusters. ## Maintenance Prune regularly to control the shape and encourage flowering. NC State recommends spring pruning immediately after bloom for major cuts. The pods and seeds should not be eaten.