Will Weigela Bushes Grow Under A Black Walnut Tree

Question

live in zone 4 north of Chicago, Illinois 7 miles west of Lake Michigan

Answer 1

In the sources I checked, I did not see weigela listed as tolerant of juglone. That doesn't mean it isn't, I just didn't find it documented one way or another. Here are some plants that are tolerant:

https://www.gardeningknowhow.com/edible/nut-trees/black-walnut/black-walnut-compatible-plants.htm
https://extension.psu.edu/landscaping-and-gardening-around-walnuts-and-other-juglone-producing-plants