are these weeds?

Asked May 10, 2015, 11:46 PM EDT

The two plants in the attached photos are in my yard. I don't know whether they are just weeds or are natives and maybe useful. Can you identify them and tell me if they are native, and aggressive spreaders or not? Thanks so much.

Montgomery County Maryland

1 Response

The plant on the left appears to be in the mustard family. The grass appears to be poa trivialis,rough stalk bluegrass. Both plants will die off with the heat of summer but the seeds will drop and most likely germinate in late summer. The grass can become very invasive and difficult to control if allowed to spread. Suggest pulling them before seed formation.