10/27/2026
We often think we’re doing our trees a favor by piling on fresh mulch—but a “mulch volcano” can become a slow-motion tree killer.
Piling organic matter directly against the trunk traps moisture exactly where it doesn’t belong, keeping bark damp and inviting decay. That cozy mound can also shelter pests and encourage roots to circle the trunk.
A tree’s root flare—the widening part at the base—should stay visible, not disappear beneath a mountain of wood chips.
Instead of burying your trees, pull the mulch back at least three inches from the trunk and keep the layer only two to three inches deep. Spread it outward, not upward.
Mulch is supposed to protect the roots—not smother the trunk. Give the base breathing room before the damage stays hidden for another season.
