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Categorized under " General" Definition as written by Terry: Roots can become girdled when they are confined (due to a too-small container or planting hole, especially in heavy soils) and a root begins growing around the trunk of the plant, preventing the uptake of nutrients.
Symptoms include a straight trunk (often on just one side), with no natural flaring, reduction in leaf size on one side of a tree or shrub, early fall coloration, excessive leaf drop, etc.
Proper planting techniques will help avoid girdling roots, as will good plant selection (e.g., Norway maples seem particularly prone to this condition.)
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