Q: We planted a new fescue lawn that is partially under an ancient oak tree. Is it okay to use a weed and feed product under the tree?
A: The label on most weed and feed products designed to kill actively growing weeds instructs the user to avoid application under trees. Your best course is to give the grass excellent management so it crowds weeds out naturally. If the area under the tree is very shady, no grass can compete with shade-tolerant weeds. In that case, occasional spot spraying with a ready-to-use weed control product would be best. Or you could simply pull weeds as they appear.