As of 2025, none of the three species of wisteria found in our area, Wisteria sinensis (Chinese wisteria), Wisteria floribunda (Japanese wisteria) or the Southeastern US native Wisteria frutescens, are regulated, invasive species in the State of New York. Wisteria sinensis is, however, considered a Tier 4 (widespread) invasive by the Lower Hudson Partnership for Regional Invasive Species Management and the Long Island Invasive Species Management Area, which means that it is aggressive and widely established in natural areas. Wisteria floribunda is rated a Tier 3 (medium threat) species by the Lower Hudson Partnership for Regional Invasive Species Management and a Tier 4 (widespread) threat by the Long Island Invasive Species Management Area.

Both Wisteria floribunda and W. sinensis are classified as invasive in the State of Connecticut and prohibited by statute. 

The ecological threat of the woody vines formed by Wisteria sinensis and Wisteria floribunda are described in these links from the National Park Service. Wisteria frutescens is less aggressive.

Courtesy of NYBG Plant Information Service