Wisteria blooms vigorously in spring, producing clusters of lilac-color flowers on new growth, which in turn emerges from spurs off the main shoots. When this gorgeous vine finishes flowering (often in June), it’s time to prune! See more about caring for wisteria, from planting to pruning in our Wisteria Growing Guide.
Wisteria is a long-lived vining plant with cascades of blue to purple flowers that look spectacular hanging from a pergola or archway in spring and early summer. However, this vine is a fast and aggressive grower—often reaching 30+ feet long—and is known to grow quite heavy. Wisteria vines will work their way into any crook or cranny they can reach, so it’s advised to not plant them too near to your home.
Wisteria flowers are beautifully fragrant, providing a feast for the senses. After flowering, a brown, bean-like pod stays on the plant until winter. Blooms only appear on new growth.
Note: Plant wisteria with caution! All parts of the wisteria plant contain substances called lectin and wisterin, which are toxic to pets, livestock, and humans. These toxins can cause anything from nausea and diarrhea to death if consumed in large amounts.
Is Wisteria an Invasive Plant?
Chinese wisteria (Wisteria sinensis) and Japanese wisteria (Wisteria floribunda) are not native to North America and are considered invasive species in some states. The native wisteria species, American wisteria (Wisteria frutescens) and Kentucky wisteria (Wisteria macrostachya), are great alternatives to the Asian species, so if you’re planning on adding a new wisteria to your garden, we suggest that you go with one of the North American species.
Wondering how to tell the difference between the Asian and North American species?
Asian wisteria are aggressive growers with fuzzy seed pods, while North American wisteria are not quite as aggressive in their growing habits and have smooth seed pods and fruits, as well as more-or-less cylindrical, bean-shaped seeds. Another difference is that American and Kentucky wisteria’s flowers appear after the plant has leafed out in the late spring, whereas the Chinese wisteria’s blooms appear before its foliage.