I’ve recently added some mulch around two trees and several shrubs in my front and back yard. but, im still curious as to what "is" the major function of it beside beautifying the areas. does it keep the moister longer or is it just for decoration?
Mulch does help the soil retain the water as well as evening out the temperature, keeping the roots cooler when it is hot and warmer when it is cold. It also suppresses weeds, so that is my favorite thing about it. Then it eventually breaks down and improves the soil.
Be careful with mulch around trees that it doesn’t touch the bark of the tree and also that it is no more than 3 or so inches deep, or you can end up suffocating the trees roots that are near the surface.