I have a hackberry tree that I planted in my backyard last year. Two questions about this: 1) As I began researching best perennials to plant under a hackberry, I read that hackberry trees produce juglone which can be toxic to plants planted nearby. Can you send me a list of juglone resistant perennials which will successfully grow in proximity to hackberry trees? How quickly do I need to move plants that are not juglone resistant? 2) I already have a mature paper birch tree established near where we planted the hackberry. I just read that paper birch are NOT juglone resistent. Is this correct? If so, how quickly do I need to remove the hackberry to prevent harming the birch?
Anoka County Minnesota
I have been researching Hackberry trees and have not found any indication that they product juglone. Here us a description of the tree from the Iowa State Department of Forestry: https://www.extension.iastate.edu/forestry/iowa_trees/trees/hackberry.html
Penn State has a great list of tolerant tree/shrubs/etc. as well as listing what trees produce juglone: https://extension.psu.edu/landscaping-and-gardening-around-walnuts-and-other-juglone-producing-plant...