another way trees make leaves --
pulp into paper printed on pages --
pages into compost --
roots into leaves
Yesterday, after the freezing rain that looked like ice BBs followed by a frosting of snow, I walked gingerly out to the compost bin with the bucket of pumpkin skins. When I lifted the ice covered lid, a mouse disappeared down into the bowels. Better here than in the house! On the way back I took the bowl full of slick pumpkin seeds and dumped them in the tray under the bird feeder. The blue jays like them, and the squirrels.
That's another part of nature's magnificent recycling center, from seeds to plants to food for animals, to excrement to compost to nourish roots. Throughout the cycle runs the sap, unless it's momentarily frozen!