I have two trees in back yard. One tree has daylillies that surround it at base. I'm not sure how they planted these but in spring daylilly foliage surrond tree. On second tree, weeds and I suspect poison ivy surround it. I was wondering if anyone has put rubber mulch around their trees and how was outcome? I know some people disagree with regular mulch stating it kills tree but what about the rubber kind? I need something to put around base of second tree.