In Watertown, this maple tree is covered in poison ivy. If you look at the green foliage in the photo, it is the poison ivy facing the sidewalk growing up the tree bark. If you are allergic, keep your eyes open, poison ivy is out and doing well. Remember the old saying, “Leaves of three, let it be.” Leave poison ivy alone in a wooded or secluded setting since it produces great berries for birds. But in an urban setting, like against a sidewalk or path, it should be treated, then removed.