Maple leaves are everywhere! Christmas come early!
Maple leaves stacked and left create a home for a very powerful growth supporter referred to as leaf mold. You can find lots of information about this by studying knf(Korean natural farming). The base of this practice for just about every growth or maintenance stimulant is leaf mold, or a handful of dirt from under a maple tree. These enzymes are so powerful they will start just about any beneficial chemical process you may want to get going!
I tend to take the lazy way out, some paper or thin cardboard over the dirt in the beds, then a thick pile of leaves ( up to 12") covering it. Allow winter and enzymes to do there thing, and presto! Great soil next year!