Amazing what eating dust from a 7" and 4.5" diamond grinders for forever does for ones constitution.Rocks were had at my local landscape and stone masonry place(Brock/White) and are a stone used for retaining walls called Lichen Mix(I think). Its not too hard--the outside is less hard than the inside. The photos are bleaching. Most of the stone was covered in mosses when I started. Its about 18" long, has a drainage hole and I expoxied in some wire hoops. It is designed for a specific tree.--I think. The key is slicing lots of parallel cuts no bigger than 5/8" or so and snapping them off. Dust mast and eye pro are a must.
