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The Importance Of Tree Thinning - Tall Timbers Tree Services Tree thinning is the removal of some trees, or parts of trees, to make room for new and healthier growth. In forestry, thinning is the selective removal of trees to improve the health and growth rate of other trees that are in the same area. Because overcrowded trees compete with each other for nutrients, water, and sunlight, there’s a big chance that they won’t get enough of their needs to grow healthy and strong.