Our backyard used to be used as a parking lot and we attempted to cover it with a layer of about 4 inches of dirt to grow grass. The grass grew in some areas but died in the majority of it. Where there is still grass, there is a lot of moss. Is there a way to solve this without excavating and removing the old asphalt? We are trying to do this on a very tight budget and thought someone might have some suggestions. Thanks for reading and your help!!