Asked October 5, 2020, 3:46 PM EDT

I live in a community that treats my lawn for grubs and I think it has tainted my milkweed. I wish to plant new milkweed in a different area. How far away must it be from a treated lawn?

Monroe County Michigan

1 Response

Plant Asclepias syriaca, common milkweed, a minimum of 10 feet from the treated area. Creeping, horizontal roots may spread to make a single plant grow up to 10 feet across in one season. Milkweed has both horizontal and vertical roots, of which can reach depths of 12.5 feet into the ground. The rhizomatous roots will quickly spread between plants and eventually to the treated area. You'll need to contain the plants away from the treated lawn and overspray area (if a spray application is used).