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Garden debris isn't necessarily bad, but it can get matted down and is less absorbent than some other products, like pine shavings.
As a gardener, I typically leave plant debris, as long as there aren't any plant diseases, as a mulch for the plants or add it to the compost. The fallen leaves are nature's way of helping insulating the soil from excessive evaporation and hot/ cold extremes. When the large chinese elm tree was trimmed, the wood chips and debris went to ornamental beds as a mulch and not the chicken coop. To me, it is more cost effective and efficient to use debris for the yard than for the chickens.
For my chickens, I normally buy bagged pine shavings for the coop since they are inexpensive and use sand in the run. I compost the shavings when I clean out the bedding, and then I eventually apply it to the garden.