To properly plant the trees volunteer would first dig a hole deep and wide enough to accommodate roots (highly variable root systems depending on tree species), place the tree in the hole, backfill with dirt and place the “weed mat” over the seedling. The mat is pinned to the ground at four corners by metal sod pins. The weed mat has a hole in the middle for the seedling to grow through, and the mat prevents competition from surrounding vegetation during the early years of growth.