Yes, tree roots can regenerate after they’re pruned or cut. In fact, trimming can stimulate new growth, especially in healthy trees. The tree’s roots can still grow back even after a tree is cut down, (and learning how to get rid of regrowing tree roots is a separate feat). Still, if you don’t wish to harm a tree, pruning the roots should be done with extreme care, and ideally by a professional.

For safety reasons, leaning trees are best removed by a professional, as they may often tear away from the hinge, causing you to lose control over where the tree falls. If you choose to cut down a tree leaning slightly, avoid cutting off root protrusions before you start. Make your hinge a little longer than usual by cutting it deeper (up to 30% of the diameter) and applying a wedge into the felling cut on the side the tree is leaning. Stand away from the direction the tree leans while making your felling cut.

Most experts recommend removing a tree that has sustained more than 25% loss in the limbs, trunk, or circumference of the bark. Doing an initial trimming of damaged and dangling branches, but then waiting a few days of monitoring to decide how much more you might need to cut can help you better assess the total damage to the tree. However, consulting a tree maintenance pro to make this determination the best course of action before removing a tree.

Homeowners are usually not responsible for trees that fall on power lines. Power companies usually have utility easements around power lines, which give them the responsibility to maintain any trees within about 15 to 20 feet of the lines.