Our wisteria over our patio is several years old. This year we are having a very dry summer and even with watering, the leaves have wilted from the newest growth to the older growth. I worry that we will lose the entire plant. Could it be going dormant or could we have another problem? So far our other plants are fine.
Wilting and Dying Wisteria
Certified GKH Gardening Expert
I would check the roots. You may have a critter in the roots that is feeding on them. The other possibility is that it was accidentally spayed with herbicide, perhaps over spray from someone spraying close by. I would spray the plant down well with water in an attempt to save it.
This article may offer additional suggestions: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-diseases.htm