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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.

In general, trees should be planted no closer than 15 to 20 feet from your foundation. For larger trees with far-reaching roots like maples, oaks, or poplars, a good guide is to plant as many feet from your home as the tree’s height is expected to reach at maturity. Some trees, like elms and willows, should only be planted far from where their roots may encounter sewer or water lines.

If a disease has attacked and destroyed the roots, then the tree may fall over as soon as it has died or while part of it is still alive. Trees that die with their roots left in place tend to stay standing for much longer, but those roots will decay eventually, allowing gravity to do the rest.

There are many signs that a tree is diseased or dying, and if you suspect that’s the case, you should call an arborist immediately. You might notice rot or fungus on the trunk or that the tree is beginning to lean to one side. Brittle branches or signs of root damage are other indicators that a tree is in trouble. If the tree is dying, it might be time to cut the tree down so it doesn’t fall.