Trees often are wounded by careless use of yard equipment like lawn mowers, weed whips, and other trimming equipment. These injuries cut through important tissues just inside the bark, which can lead to the decay and ultimately death of the tree. A bed of mulch around the tree eliminates the need to trim or mow close to the tree’s base. Extreme care should be taken when digging up or tilling the soil under a tree. Such digging will cut many large and small roots, especially if it occurs close to the trunk.