Although a tree may appear healthy at first glance, the roots below the surface might be telling a different story. In fact, if most or all of the root system is completely below the surface, that could be a sign of a tree in need of some help through root excavation. Experts like those at Advance Tree Pros use a technique called air spading to release portions of the root system that may be covered by dirt, mulch, rocks, or other earthly debris. Tree trunks have a sensitive section where the trunk transitions into the root system that spreads out underground. This is called the root flare, and it is important that it remains above ground. When the root flare is not clearly visible, and it seems that the trunk disappears directly into the ground, excavation may be imperative to maintaining the health of the tree.