Every old stone wall in Harvard is a small wilderness of its own, and by the middle of June the ivy has found all of them. Cooper's Poison Ivy Removal Service works those edges: the shaded seam where a mowed lawn meets the wood line, the fence posts, the base of the maples, the tumbled fieldstone that no mower has ever been able to reach. The reward is simple and immediate, a yard whose borders a barefoot kid can cross without paying for it in August. Down near the brooks the hemlock shade keeps the ground damp and the vines keep coming back, which is why the work is patient rather than dramatic. Clearing a boundary line clean and leaving the grass to run right up to the wall is a quietly excellent way to spend a summer morning.