Controlling Unwanted Locust Tree Sprouts in Michigan

A property in NW Lower Michigan has locust trees spreading via root suckers into areas the owner wants tree-free. Mowing alone won't stop the underground spread.

Effective Control Strategy

1. Herbicide on suckers: Use a lawn-safe broadleaf herbicide (e.g., triclopyr, 2,4-D blend) on actively growing sprouts. Follow label.
2. Cut-stump treatment for parent trees: If you're willing to sacrifice the main trees, cut them and immediately paint glyphosate (Roundup) concentrate on the stumps. This kills the root system and stops suckering.
3. Warning: Spraying suckers connected to a parent you want to keep may damage or kill that parent.

Ongoing Maintenance

Mow regularly to suppress new sprouts. Accept that complete eradication without removing parent trees is difficult—locusts are aggressive colonizers.