How big is the root system of a tree?
Herein, how deep do tree roots really grow?
Under ideal soil and moisture conditions, roots have been observed to grow to more than 20 feet (6 meters) deep. Early studies of tree roots from the 1930s, often working in easy-to-dig loess soils, presented an image of trees with deep roots and root architecture that mimicked the structure of the top of the tree.
Also to know, how far do fir tree roots spread?
4 Answers. New research tools have allowed arborists to learn more about tree roots. Tree roots can extend as far as two or three times the width of the drip line, or the farthest point from the tree where foliage grows.
Once the tree has been cut, the roots cannot grow anymore because the leaves are necessary to provide the food to fuel root growth. If the roots continue to produce sprouts with leaves, then in time there may be more root growth.