Japanese knotweed (eradication)

Japanese knotweed is extremely difficult to eradicate. The shoots can grow up to 20cm per day, rooting depth can be at least 3m and some rhizomes can extend for tens of metres at a time before giving rise to a new plant. All control treatments should be in accordance with Environment Agency advice. Soil or other waste contaminated with Japanese knotweed is controlled waste if transported from a site, when a license from the Environment Agency is required to ensure its safe legal disposal.

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