My Redbud Tree Is Very Near A Locust Tree And Is Really Struggling. Do Locust Trees Cause Problems For Other Trees?

Question

I have a redbud tree and two crepe myrtle shrubs planted near, or under, the spread of some old mature locust trees. Is the locust causing damage?

Answer 1

Black locust has deep roots that spread and can cause problems for other plants. Some studies also suggest it gives off chemicals that are detrimental to other plants. Also, your trees may not be getting enough sun.

https://mbgna.umich.edu/invasive-of-the-week-black-locust/#:~:text=Some%20studies%20suggest%20that%20black,of%20other%20plants%20(allelopathy)
https://www.gardeningknowhow.com/ornamental/trees/locust/growing-black-locust-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/locust/honey-locust-information.htm