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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.

Generally, no, tree topping isn’t a good technique, and you should avoid using it in most cases. Tree topping may be the only good option to save a tree following severe damage after a storm, but in most other cases, it’s not the right choice. Tree topping can leave trees vulnerable to disease and further damage, and most pros will suggest against it.

We don’t recommend DIY tree trimming for a few different reasons. First, the tools required to trim a tree can be costly, up to $1,100 or more, for the ladders and specialized saws needed. 

Safety is another concern, especially when working with more mature trees. As a guideline, you should only DIY tree trimming when branches are less than two inches in diameter. Any more, and the safety risk becomes too high, which could lead to catastrophe. For this job, it’s safest to let a tree-trimming professional assess the work needed.

You can start your search for a reputable arborist online by looking for professionals who hold the proper licensing and are fully insured. Next, read through some online reviews to see what kind of service the expert brings to the table, and confirm that they don’t have a history of complaints with the Better Business Bureau. Finally, you can ask the professional for a list of references and then call them to ask questions about the service, professionalism, value, and more that the expert brings to the table.