I leave all my cuttings and leaves in place since I live on a sand dune and all of it needs every bit of organic matter it can get.umm I go to town and get bagged leaves on garbage day, if it's been dry. The leaves I collect with the mower bagger have grass with them and will mold. I use those right away.
My cousin sweeps her cut dry grass and I go over with my truck and fill the 8'bed and bag it when i get home. If it's good and dry... sometimes it's not quit dry and I use that right away. The chickens stir it up so it doesn't mold