Emerging weeds post over-seed

Asked September 28, 2020, 9:34 AM EDT

Hello, ~1 month ago we overseeded but and are now seeing some variety of weed that we have previously never had an issue with. Trying to identify each and best way to remove and prevent. Thank you in advance for this awesome resource!

Frederick County Maryland

1 Response

Left photo - This looks like deadnettle, a winter annual weed.
Middle and right photos - looks like deadnettle and hairy bittercress, winter annual weeds.
Here are our webpages on these winter annual weeds and management in the lawn. Shade and mowing the lawn too short are conditions that favor this weed. https://extension.umd.edu/hgic/topics/deadnettle

If you have small patches, you may be able to handpull or dig the weeds with a weeding tool. Since the lawn is newly seeded, you will have to wait until you mow the grass about 3-4 times before using an herbicide to spot treat the weeds.
Here is more about lawn care after seeding https://extension.umd.edu/hgic/topics/care-and-maintenance-after-seeding