Grassy Weed Identification

Asked June 24, 2020, 11:19 AM EDT

Would like to know exactly what weed is in some of my lawn.

Macomb County Michigan

1 Response

It is hard to be certain based on the photos, but this looks like tall fescue (Schedonorus arundinaceus...previously known by other genera i.e. Lolium and Festuca). This is an introduced cool-season perennial grass in Michigan and a common weedy grass found in lawns. You can usually spot it from far away because the blades are wider than our typical desired turf species and after it is cut it often looks like the cut tips die back slightly.

If you examine the finer features of your grass, where the leaf meets the sheath, you should be able to confirm this identification. This site may help, especially the third photo from the bottom. You can see the light color around where the leaf blade clasps to the stem, this is pretty characteristic of this weed, along with the ridged appearance of the leaf surface.