Bermuda grass vs Yarrow
 

I have a small central area in my garden that I seeded with yarrow two
years ago to create a small yarrow lawn. Unfortunately, it is starting
to be invaded by bermuda grass. I thought the yarrow was successfully
competing with the bermudagrass, but lately it looks like the bermuda
grass is starting to establish itself. Can anyone offer suggestions as
to how to help the yarrow win?

Thanks!

Andy