A layer of mulch around the base of a tree protects it from damage and keeps back the grass. Grass can compete with the tree roots for oxygen, moisture and nutrients. The mulch also protects the tree from mowers.
Spread the mulch about 2 to 3 inches deep and don’t heap it against the tree. The mulch piled against the tree creates favorable conditions for decay. The bark needs to be exposed to the air to function properly.
Too much mulch allows for bugs insects, bacteria, mice and voles to hibernate and eat the bark, cutting off the flow of water and nutrients.

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