When we went to plant these fruit trees and started digging, we realized that there was less than 4 in of topsoil before hitting the Limestone that's called caliche here in Texas. So I decided to bring in 5-10 wheelbarrows of good clay loam and build up about 6 to 10 in of soil in which to plant trees. Has anybody else tried this method, and how has your success been? I realize that over time the tree's roots are going to want to spread further so we'll need to bring in more topsoil and move the rock walls out further. I also realize that the raised beds will require watering, basically forever, unless I extend them out basically forever....