What Is This On The Stem Of My Wiegela?

Question

Zone 8

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Answer 1

This reminds me of crown galls! This is caused by the bacterium, Rhizobium radiobacter. This is unfortunate. The only cure will be removal, though you could attempt to solarize your soil between plantings.

Here are some articles with more information:

https://www.gardeningknowhow.com/plant-problems/disease/how-to-fix-crown-gall.htm

https://www.gardeningknowhow.com/ornamental/shrubs/weigela/weigela-problems.htm

https://www.gardeningknowhow.com/garden-how-to/projects/how-to-solarize-garden-beds-to-eliminate-garden-pests-in-the-soil.htm