That looks very similar to what I have at my house too. I have never had it change into anything different so I ended up pulling the patches along my retaining walls.
And speaking of that, I really need to get a good weed killer, but not something too toxic. I will need a lot for my sidewalks and pathways on a corner lot. Anyone have good products or deals, websites to share for ordering bulk?? I found a good home/garden Walmart coupon here, but don't know what to get.
On a yard budget!!