What is this? Roots wrapping around the base of the tree in a circular shape instead of growing straight out from the base of the tree are called girdling roots.
How do I fix it? For young trees already in the ground, smaller girdling roots growing at the surface and around the trunk can be removed by using bypass pruners or a hand saw. For more mature trees with girdling roots, always consult a professional. These are far more difficult to remove, and may need to be done in stages so as to not harm the tree.
Can it be prevented in the future? Girdling roots can be prevented when you are planting a tree. When planting a container tree you should cut away, or ‘score’, the roots using a utility knife. It may seem counterintuitive to break up tree roots, but this is actually good! If roots have begun circling the pot, cutting them up will prevent them from continuing to circle, encouraging them to grow outwards instead of around. The planting hole should be approximately three times as large as the tree’s root ball so the roots are able to grow out. The root flare should be at or above ground level, as planting a tree too deep can also lead to girdled roots.
Visit our blog post on root girdling for more information.
