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What changes: Leaves change color, drop off. Tree metabolism slows. Soil temperature drops, root growth slows. Autumn care tips: Clean up fallen leaves and debris. Decaying leaves can harbor disease; compost what you can, remove what you can’t. Final pruning. Remove any hazardous or dead limbs before snow and ice arrive. Avoid pruning too late in fall (very close to freezing), as wounds heal slowly in cold. Mulch again. Replenish mulch to insulate roots during winter. Water well. Before the ground freezes, give trees a good deep watering. Drought stress going into winter can lead to winterkill.