I put about 2-3" of leaves from my yard on top of my garden last October. I let them sit there all winter. I am now excited to get started to prepare my garden, but I am curious as to what to do with the leaves. Should I attempt to till them into the soil, remove them, or acquire new top soil to put over them? My first garden was last year and I had dug up and turned over a patch of grass. Should I do that again, turning the leaves under? I have heard it is damaging to the soil structure to do that again.