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stoughton WI

Elm trees. Some elms exhibit allelopathy, a process where roots, leaves or shoots secrete chemicals that kill or severely retard the growth of plants growing nearby. Black walnut isn't the only tree that produces juglone. This chemical is also secreted in smaller amounts by English walnut, hickory and pecan trees.Other trees with allelopathic properties include tree-of-heaven, sugar maple, hackberry, American sycamore, American elm, southern wax myrtle, cottonwood, black cherry, sassafras, red oak and black locust.

9/24/2018 9:36:14 PM

Anamosa, IA BPIowegian@aol.com

Willows are one that can send roots a long distance to steal water and nutrients. They can easily send roots over 100' to plug up farmers' tile lines. I had to fight willow roots for several years in my garden before I finally got them killed out. They kept popping up all over the place, but cutting them out eventually exhausted the root reserves.

And although locust trees can have alleopathic properties, they are also a legume and can fix nitrogen in the soil.

9/24/2018 11:16:41 PM