Q: I have a plant in my lawn that spreads out like a mat in August and September.
What can I do to control it?
A: You have prostrate spurge.
It is classified as a summer broadleaf annual. That means you can control it two ways: by applying an appropriate pre-emergent chemical in spring or by spot-spraying each clump with a broadleaf weed killer when you notice it.
The weed is also easy to pull by hand.