A tree usually has 4 to 7 major roots.
A general rule for cutting tree roots is don’t cut more than 25% of the root system. Measure the trunk diameter at about 4 feet from the ground. Take that measurement and multiply it by 6. Mark off that distance from the trunk and that is about where 25% of the roots can be cut.
It is difficult to say how much of a tree's root system can be removed.
See image shrubpruning.barted Reading Time: 2 mins. Feb 04, You can use rooting powder if you desire, which can help with root growth and prevent rot. Make holes for your cuttings using a pencil and spacing the holes at least 2 inches apart in the pot, and apply vermeer stump grinder 522a rooting powder to the bottom third of your cuttings. You can then insert the cuttings.
Sep 29, Generally, you can safely prune roots that are times the diameter away from your tree. So, if your tree has a diameter of 3 feet, only cut tree roots feet away from the tree. Mark the area you’ll cut, and dig a hole all the way around the root until it is completely exposed. Use a root saw to prune the tree.
Balance between the tree’s crown (top) and root system is important for maintaining healthy trees. When roots are lost for any reason, the imbalance creates stress. A tree usually has 4 to 7 major roots. Cutting just one of them within a few feet of the trunk can remove up to 25 percent of the root system.