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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.

State and local laws vary, but in most cases, you are allowed to trim any branches from your neighbor's tree that cross your property line. However, it's important to ensure you do not damage the overall health of the tree in the process. Removing branches incorrectly can jeopardize the health of the tree and could lead to you being on the hook to replace it.

A dead tree should always be cut down, because it could fall and cause injuries or damage, and it can also attract insects like carpenter ants. A tree that’s diseased beyond repair should also be cut down, but it’s not always easy for a homeowner to tell. Signs of disease include dying branches, a hollow trunk, leaning, and discolored or missing leaves, but your best bet is to hire a local arborist who can evaluate the tree and tell you if it can be saved or should be cut down.

The speed of your tree root removal process depends on a few different factors, including the size and type of tree. However, the fastest method of killing tree roots is applying chemical herbicide, which starts working quickly and efficiently. But this removal method has its drawbacks, such as having a negative effect on the surrounding vegetation and landscaping. Other options like rock salt and stump grinding work relatively quickly and cause less damage to your yard.