Interesting. Maybe that is where all of our snails are coming from too. We go back and forth on the edging for the beds. The rocks are hard to edge, the bricks don't stay in place, and metal trim isn't enough, we don't like the stacked pavers... Maybe we should just pull all the flowers out and let the grass grow right up to the foundation.
I have black, pink, red, and white tulips. I guess I will have to pull them all since I have no idea which are which.