We’ve written before about the benefits of leaving the leaves on the grass – it just makes for a much healthier lawn. But one thing we didn’t mention is that within that leaf litter is a whole thriving habitat that would really like to stay.
David Mizejewski, a Naturalist at the National Wildlife Federation, agrees.
“Leaves are nature’s natural mulch and fertilizer,” Mizejewski says. “When you rake all the leaves away, you are removing that natural benefit to your garden and lawns – then people turn around and spend money to buy mulch.”
https://www.treehugger.com/lawn-garden/another-reason-not-rake-leaves-your-lawn.html