We reside in a townhome association in Mendota Heights and have many mature, 20+ year old trees that have exposed roots, possibly due to clay soil. Our Association Manager is proposing the grinding down of the exposed roots. Some are concerned this may be damaging to the trees and bring about their demise. Could you please respond with the best methods for treating mature trees with heavily exposed roots and should we allow the roots to be “ground down.” Thank You! Kathryn Haight My husband James and I are members of the Minnesota Landscape Arboretum and my husband is a Lifetime Alumni Member of the University of Minnesota. Go Gophers!