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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 can use a chainsaw, but it won’t remove the entire stump or root ball and is not a recommended method. It takes quite a bit of physical work to achieve and will likely dull or ruin your chainsaw. Instead, consider using salt, herbicide, light deprivation, boiling water, stump grinding, or burning to kill a tree stump. These methods allow you to kill a stump using minimal machinery and physical exertion.

In most cases, you should not use a pruning seal on trees after trimming. Applying a sealant can interfere with the tree's natural healing process, and it does not guarantee protection from pathogens. Instead of sealing the cut, the best practice is to support the tree's natural recovery by providing it with plenty of water and a dormant-style fertilizer. However, there are exceptions. Pruning seals may be recommended for very vulnerable species, like elm trees, in areas where dangerous diseases such as Dutch elm disease are prevalent. In these specific situations, the protection offered by a sealant can outweigh its downsides. For advice tailored to your situation, especially after cutting large branches, it is best to consult a local tree trimming professional.

Trees should be pruned every two to five years, depending on its age and type. Young trees should be inspected and pruned every two to three years. Mature trees should be inspected and trimmed every three to five years, and fruit trees should be pruned annually with a careful eye on seasonal growth. Evergreens typically don’t need pruning, unless branches or limbs are damaged, diseased, or harboring pests.