Q. Dear Neil: Is it a good idea to topdress a lawn with topsoil in the spring? My dad used to do that when I was a kid. I donât see people doing it as much anymore. A. I donât mean to diminish your dadâs hard work, but it doesnât make any sense unless you have a lawn that is uneven with ruts that need to be filled in. The problem with bringing topsoil in is that you run a big risk of introducing weeds like nutsedge at the same time. Plus, if you donât really need to change the grade, youâre effectively raising your lawn each time that you add soil. You could change the flow of water across your yard. It wouldnât happen in one year, but it could if you did it year after year. My vote is not to topdress your lawn.