dwarf Japanese knotweed (Fallopia japonica var. compacta)

A variety of Japanese knotweed growing up to 1.0m in height. The leaves are dark green and leathery, almost as wide as long (broadly ovate), and the leaf edges are wavy and tend to turn upwards to make the leaf cupped.

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