How to Mulch a Tree Line

Mulch is an often underestimated landscaping tool. When applied correctly, mulch helps keep the soil over a tree line's roots moist, temperate and nutritious. Mulch suppresses the growth of grass and other weeds that steal nutrients and moisture from the tree. It can also serve as a decorative element in the landscape. According to the Northeast Center for Urban Community and Forestry, partially composted organic bark makes the best mulch for trees.

Organic mulch

Instructions

- 1
  Spread a 2- to 4-inch layer of organic mulch around the roots of each tree. Apply fine mulches, including pine straw or shredded bark, thinly. Larger mulches, like bark and wood chips, may be spread more thickly. The mulch should extend beyond the drip line of each tree (up to 1.5 times the diameter of the canopy) and form an unbroken layer between the tress. At a minimum, extend the mulch to the drip line of each tree.
- 2
  Pull the mulch away from the base of each tree. Leave a 4-inch-wide mulch-free circle around the trunk.
- 3
  Replenish the mulch layer as needed to keep it at a consistent height. Fine mulch may need replenishing as often as once annually. Larger mulch should last longer. Before applying a fresh layer of mulch, rake and turn the old mulch to break up any matting.

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