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Pruning can impact cold hardiness—but it’s less about the exact temperature and more about temperature variation. Generally, you don’t want to prune trees when there’s a risk of temperatures suddenly dropping from 50 to 60 degrees Fahrenheit to 0 degrees Fahrenheit or below. A tree is most sensitive until 48 hours after it’s pruned.

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.

The cost of professional tree service, such as trimming, is $460 on average, but the price can range from $75 to $1,800. A more typical range is between $200 and $760. The final price depends on several factors, including the size and type of the tree. For example, trimming Crepe Myrtle trees costs an average of $80 to $400, while giant pine trees can range from $200 to $1,800. Other factors that influence the cost include the time of year, as services are often more expensive in the spring. Your location can also play a role; costs may be higher if you live in a remote area or if the tree is difficult to access. However, some professionals may offer a discount if you have multiple trees that need service.

Aside from removing dead or diseased branches, you should prune your trees somewhere between every one and three years. Some people—particularly commercial farmers—prune their apple trees yearly to produce higher yields. This is the best way to promote tree health. That said, the average homeowner can get away with hard-pruning their mature apple tree every other year or every three years.