There are actually several varieties of Japanese knotweed in the UK. In addition to the most common variety, Fallopia japonica var. japonica - around 98% of the plants.. Fallopia japonica (Japanese knotweed) is a well-known invasive alien species in the UK and elsewhere in Europe and North America. The plant is known to have a negative impact on local biodiversity, flood risk and ecosystem services; but in the UK it is also considered to pose a significant risk to the structural integrity of buildings that are within seven m of the above ground portions of the.

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Purchase a suitable weed killer. You'll need something strong to do this job, ideally one that is glyphosate-based. Look for types that have Japanese knotweed listed on the label, such as Roundup Tree Stump. Protect yourself from the strong chemicals with suitable clothing, including gloves and eye-protective goggles.. Japanese knotweed is a shrub like herbaceous perennial and can grow as tall as 10 feet (3m). Leaves are simple, alternate and average 3-6 inches long by 2-5 inches wide (8-15 cm x 5-12 cm). Like other members of the Polygonaceae family, Japanese knotweeds have the characteristic sheathed nodes (ocrea) (Gleason and Cronquist 1991).