Use a rake or shovel to level the soil around the fruit tree with the existing grade.
Cover the soil, from 6 inches away from the tree's trunk to 1 foot beyond its drip line, with 3 inches of mulch. Spread it in a circle around the fruit tree.
Build a ring out of wet soil, at the outside edge of the mulch. Use topsoil or bring in soil from another part of the garden. The ring should be 5 inches tall and 6 inches thick. Pack the ring with your hands to keep it in place as you form it around the fruit tree.
Fill the ring with water every time you irrigate the fruit tree.
Dig a trench around the tree where you want to place the tree ring. The depth of the trench depends on the size of edging you use, but generally it should be 4 to 6 inches in depth and 8 to 12 inches wide.
Tamp the soil at the bottom of the trench so that it’s firm.
Place the edging in the trench, so that the front edge abuts the front edge of the trench. Use the carpenter’s level to ensure that the ring is level. Use a rubber mallet to pound down any edging that is too tall and add paving sand under any that are too short.
Add paving sand or soil around the inside edge of the ring to hold the edging in place.