Posted: 21/03/2014 at 14:42
I think I'd rather look at bare soil around a tree than 3 feet high concrete blocks. Does that mean the tree will have 3 feet of soil up its trunk. It may complain about that, though being a willow it may not.
How big is this tree, I have a garden full of trees and plants grow under them, you just need to grow the right ones.