Composted chippings can be used as mulch, which is great for growing gardens. The best use of wood chip mulch is around trees and shrubs. In the border, properly applied, composted wood chip mulch will suppress weeds, enhance plant growth, conserve soil moisture and insulate soil from temperature fluctuations.
The mulch should be laid no more than 4 inches deep and tamped down. If you are mulching trees or shrubs, the mulch should extend beyond the canopy, and be 6 inches away from the trunk.
If you are making a new planting in a lawn, remove the turf to a diameter of 3 feet greater than the planting hole and apply the mulch as above. If the tree to be mulched is established in a lawn, do not remove the turf before mulching, as this may cause surface root damage.