root deflector

A barrier to roots, typically installed around newly planted trees in urban contexts to direct future root growth away from nearby footways, kerbs etc., avoiding the risk of displacement. The barrier is a cylinder of a flexible material about 30cm deep orientated like the side wall of a large plant pot, the roots subsequently growing around the base of the deflector.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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