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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.

Yes, cutting a tree's roots can cause it to fall, particularly if major support roots are severed. In extreme cases, trimming roots can affect the tree's structure and stability. Many crucial roots are located just below the soil's surface. If you make severe cuts to roots more than 2 inches in diameter, you risk impacting the tree's water flow and its ability to withstand severe winds or storms. Even cutting roots less than half an inch in diameter under or outside the tree's canopy can cut off its water supply, causing it to decline, die, and eventually topple.

If you’re wondering whether you can plant a tree where the stump was removed, know that the soil conditions won’t be ideal, so you should avoid it. The soil beneath the previous tree will likely be depleted of nutrients, plus there may be roots left behind that will seriously hinder the growth of a new tree. Also, if you use salt or other chemical solutions to kill the stump, these can linger in the soil for months or even years and prevent healthy growth. It’s best to choose a different spot that’s at least three feet away for a new tree, or wait at least a year and thoroughly amend the soil before you plant.

Light-bark trees are most notorious for producing lots of sap when wounded. These varieties include maples, birches, poplars, dogwoods, magnolias, and elms, and they will bleed more when the trees are dormant. That’s why it’s a good idea to prune them in the summer months rather than waiting until winter.