Wisteria Vines

Causes of Black Nodules Wisteria Stems

Anonymous added on December 20, 2014 | Answered

What causes black warts on the stems of Wisteria?

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Certified GKH Gardening Expert
Answered on December 22, 2014

It is not uncommon for roots of wisteria to have black-looking nodules on them but on the stems, this could be attributed to pests or a fungus. I would recommend treating with neem oil. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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