March of the knotweeds

Japanese knotweed (Fallopia japonica) and its sister species, giant knotweed (Fallopia sachalinensis), are the scourge of Britain. Originally introduced in the early 19th century as ornamental and fodder plants, and celebrated for their amazing ability to survive the slopes of active volcanoes in their native Japan, these species have become a nightmare for developers and house-owners alike.

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