Generally, how deep and wide do tree roots grow?
90% of tree roots are located in the top two feet of the soil. The other 10% of the root system can go much deeper, 12 feet and more. Tree roots need oxygen to provide nourishment to the tree. There is more oxygen in the top two feet, so that is where the majority of the roots can be found. Deep rooting depends on the species, the soil, and the availability of moisture. Very heavy and hard clay discourages deep root growth. Sandy or loamy soil allows for deeper root penetration. Heavy lawn watering encourages more surface rooting. Tree roots extend beyond the drip line of the tree canopy. As a general rule, the farther away the tree roots are from the tree, the smaller the roots are in circumference.
