Root Flare
The root flare is the transition near the base of a tree where the trunk broadens into major roots. Recognizing it helps avoid planting a mango too deeply or piling mulch against the trunk. Nursery media can hide the original position, so inspect the tree rather than assuming the top of the pot always marks the correct ground level. A visible graft union is a different feature, usually higher on the stem, and should not be mistaken for the root flare.