It should stop root invasion in both directions, Ken! Yes, I've gotten lazy about moving the big old pots and then discovered the plants were rooted in the ground below in the past!
I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority. E. B.White
Integrity can never be taken. It can only be given, and I wasn't going to give it up to these people. Gary Mowad