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Posted On Jun 23, 2025

Updated On Jul 16, 2025

Wisteria Toxicity

Emergency & Critical Care

Contributed by Elisa Mazzaferro, MS, DVM, PhD, DACVECC

I'm an avid gardener and learned something new this week! I saw my first case of wisteria toxicity. 

Wisteria is a vine that has beautiful, light purple grape-like clusters of flowers. Some species bloom twice a year. In addition to causing gastrointestinal signs of vomiting and intense cramping, wisteria can make some dogs salivate, have hematemesis, and diarrhea. Anecdotally, wisteria can also cause a dog to hallucinate. Another reminder to take thorough histories about possible exposures ...

A close-up of a tree with purple flowers

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Originally posted on October 16, 2013