I use dry leaves in my run year round! They make an excellent (and free) run bedding material. I collect and bag them in the fall after they've dried fully, store them in a protected area and use them throughout the year. My chickens LOVE "dump day" when I dump a bag or two in their run! They spend hours scratching around spreading the leaves, looking for hidden treasures. They shred them completely in a couple of weeks, and mix them around with the poop and other run substrate. The carbon from the leaves combines with the nitrogen from the poop, and water from rain/snow, to form a nice compost that doesn't smell or look poopy. I have wood chips in the run as well, and add all the cut grass in the summer, and together this all makes for a great active compost in the run that looks and smells nice, and is enriching for the chickens who love scratching through it. So I actually don't clean the run - I don't have to. Bonus: this kind of run substrate doesn't get muddy, or freeze solid in the winter. When it snows, I shovel what I can and cover the rest with dry leaves, and the chickens are happy and spend all day outside even in the winter (they hate stepping on snow or ice). Everybody wins!
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