Mulching is a standard horticulture practice.

Mulch around trees keeps the roots at an ideal temperature.

Mulch acts as a constant insulator for our tree by keeping the soil warm in winter and cool in summer. Organic, coarser mulch does a better job at this than inorganic or processed mulches, like fabrics or plastics.

Swedish University Sep 02, Mulching trees keeps down weeds, thus eliminating competition for water. In addition, much of the water that otherwise would be evaporated by the sun can soak down through a 2-inch layer of mulch and into the soil around tree roots. Jun 28, Mulch is a material applied to the surface of the soil around trees and shrubs.

Sawdust and, to a lesser extent, wood chips deplete soil nitrogen, if worked into the soil.

Mulch reduces weeds, conserves soil moisture, and minimizes soil erosion. Mulching is a standard horticulture practice. Maximize the growth of new trees and shrubs by mulching an area underneath the plants instead of planting grass, shrubs, or groundcover. May 10, Mulch reduces weeds, conserves moisture and improves the soil, which helps your tree stay healthy!

But when it comes to mulch, it is possible to have too much of a good thing. Piling mulch too high and covering a tree's trunk, also known as “volcano mulching” can cause decay. Problems Caused by Mulch That’s Too Thick Around Trees.