lesser knotweed (Persicaria campanulata)

A knotweed native to north India eastward, resembling other knotweeds but relatively small, growing to height 0.9m. In Britain lesser knotweed is a garden escape found on roadsides, riverbanks, waste ground and in woodland, mainly in the west. The leaves of lesser knotweed are semi-evergreen with veins arranged in a conspicuous and attractive grooved herringbone pattern. Like other knotweeds it spreads vegetatively to form clumps, but the Non-Native Species Secretariat considers it to be non-invasive.

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