Burying Tree Roots
Can tree roots be buried? We have mature pines, and a linden on a hill. Our manager built a wall at the bottom of the hill, back-filled and mulched the area, 1 foot or more up around the trunks.
Denver County Colorado trees and shrubs
Burying roots of mature trees by adding additional soil can cause serious injury to the tree. Here is a link to Fact Sheet 2.926, Healthy Roots & Healthy Trees, a publication of Colorado State University. The fact sheet provides details that address your question. http://extension.colostate.edu/topic-areas/yard-garden/healthy-roots-and-healthy-trees-2-926/