3-6 inches of mulch on top of the soil will: Reduce evaporation from the soil and the need to water- in the summer Protect plant roots from freezing temperatures- in the winter Reduce soil erosion Discourages weeds Helps increase soil fertility and absorption Greenwaste Processing Sites The City of Tulsa's Public Works Department has two Greenwaste Processing Sites where you can drop off tree trimmings and yard waste and pick up free mulch for your gardens and landscaping.
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