Area around the base of the tree where the trunk and root system merge; the root crown.
The point of separation between the stem and root of a plant
The flared lower portion of the base of a tree where the roots and stem merge. Also referred to as the "root crown" or "root flare."
The region of the plant where the major roots arise; the transition zone between the stem and the root, sometimes recognisable by a slight swelling.
Forest Stewardship] The transition zone between stem and root at the ground line of a tree or seedling.