The Root System of Oak Trees | Home Guides | SF Gate - Mature oak roots
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The root system of a mature oak tree can total hundreds of miles. Most oak tree roots lie only 18 inches under the soil. The greatest threats to the health of an oak tree's root system include poor drainage, trenching nearby and paving. Caring for the large exposed roots that break through the surface of the soil will Adding a layer of coarse, organic mulch around a mature oak also can slow.