Marco Banks wrote:Comfrey really isn't invasive. If you want to get rid of it, first mow it flat to the ground. Then just lay a piece of black plastic over it and weigh it down with a couple of stones or scoops of soil. It'll be gone in 6 months. Bocking 4 or 14 will not "travel" --- it will get slightly larger with each passing year, but it's not suddenly going to pop up 10 feet away.
I would imagine that eventually, anything will die that is planted at the base of a pecan tree that will grow to 50 feet tall. That includes comfrey.