It works with layers of wet newspapers too! I use that method for all plantings near my big trees as the root competition is fierce. Gives the new guy time to get big enough to duke it out with the tree.
I need to try that; I have a rose bed that is lined with trees and the roots are a problem for the recently planted roses, I'm sure. - Definitely easier than the box method.
They fooled us and never left They just waited us out and then made a new door behind the bird bath. Obviously skunks are smarter than the average baer My tru luv looks like this about it