Maintaining your vegetation growth to prolong your siding and shingles By Pete Busch Like all things our trees and shrubs in our yards need periodic maintenance. Honestly though, as a home inspector I couldn't care less about the health of your trees, shrubs, or flower garden and if you asked me for growing advise I wouldn't know what to tell you. What I can tell you though is if you don't keep them trimmed away from your valuable siding or roof you will cause abrasion damage which.