Black Walnut tolerent
Do you know if a Mulberry tree will grow near a Black Walnut tree?
Monroe County Pennsylvania
The following link provides an overview of juglone and a list of trees and shrubs that exhibit a tolerance to the juglone. Although mulberry trees are not on the list it is still possible that your mulberry tree might tolerate the conditions. https://extension.psu.edu/landscaping-and-gardening-around-walnuts-and-other-juglone-producing-plants