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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.

You should prune ornamental trees once every other year after the fruit has matured and begun to drop. You should also prune out dead branches whenever you see them. Pruning too often can stimulate more growth, especially in faster growing varieties like Bradford pears.

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.

Generally, you do not have the right to take fruit from a neighbor's tree, even if the branches overhang your property. The fruit is considered the property of the tree's owner. While you may have the right to trim branches that cross into your yard, the fruit on them typically still belongs to your neighbor. However, laws can vary by state and municipality. In some areas, branches that extend into your yard or trees that straddle a property line may entitle you to some of the fruit. The best course of action is to speak with your neighbor, as they may be happy to share. If a conversation is not possible, check your local regulations before picking any fruit.