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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.

Stump grinding consists of removing the visible part of the stump, but the roots remain intact. Depending on the tree and root system, the roots may still grow after stump grinding. If you are concerned about root growth and damage, you may want to consider having a stump removed completely.

Licensing requirements for arborists, also known as tree surgeons, vary by state and municipality. Many areas require a license, which often involves specialized education and experience. Even if not mandated, it's wise to hire a licensed professional as they tend to have more experience. Beyond licensing, look for certifications from organizations like the International Society of Arboriculture (ISA) or the Tree Care Industry Association (TCIA), as this indicates a higher level of expertise. Certified arborists must typically pass a comprehensive exam. Always confirm that the arborist has a business license and is fully insured to protect yourself from liability. Seeking positive recommendations from local homeowners is also a good step in finding a qualified professional.

The recovery time for pruning depends on how much you prune, the species of tree, and how well you care for it afterward. All trees grow new wood and often sprout additional branches after pruning. Ideally, trees should recover from normal pruning after one or two years. Heavy pruning or slow-growing trees may take several years to fully recover.