Some cool things happen by accident. I use a self propelled mower with a bagger to save most of my lawn clippings and last fall I covered a small pile of grass clippings with a tarp, then forgot and left them all winter. I uncovered them this spring and when I (later) started to pick them up with my hay fork at least a hundred mason bees came boiling out. They weren't aggressive, just startled. I'm planning on experimenting with turning my accidental bee habitat into something intentional...maybe add some protection with a couple of concrete blocks holding a fiberglass roof over a pile of grass clippings.
