Guide to edging around trees and mulch beds.
DON’T pile mulch against the tree trunk. 7 / The same rule that goes for soil goes for mulch–don’t cover the base of the tree trunk. Leave eight to 10 inches of bare ground around the Estimated Reading Time: 6 mins. Oct 08, Your rock or stone border should sit just outside of the dripline so it doesn’t interfere with the tree’s roots.
Dig a 3 to 5-inch-deep trench, making sure it’s wide enough to fit the rocks or stones you have.
Mark that area all the way around the tree with a rope or spray paint.
Line the trench with a thin layer of mulch. Place the rocks or stones along the trench with an equal amount of space between them.