lawn cicrles

Asked September 5, 2017, 4:57 PM EDT

can you please help diagnose these lawn circles. No one has been able to so far. They are getting bigger every year and multiplying. Thank you, Jim

Hennepin County Minnesota lawn weeds bentgrass

1 Response

We can't be certain by viewing the photos but we think the lawn may be infested with a grassy weed called creeping bentgrass. Compare here:
http://www.msuturfweeds.net/details/_/creeping_bentgrass_42/


Nimblewill is a grassy lawn weed with a similar appearance. However, it is uncommon in Minnesota.
https://www.extension.iastate.edu/turfgrass/blog/nimblewill-control-kentucky-bluegrass-turf