We have eight columnar aspens in our back yard. We are trying for a maintenance free yard, so removed all grass and poured a pad of stamped concrete below our wooden layered decks. We put down the black material(not sure of name) to stop weeds from coming thru, then placed wood/bark chips under the row of trees. In the fall and spring, the leaves are a nightmare to pick up in the wood chips under the trees. Any ideas as to something else we could put under the trees to look appealing as well as easy to collect the leaves.