Japanese Knotweed Japanese Knotweed (scientific name Fallopia japonica) is Britain's most invasive non-native plant. It was originally brought from the Far East as an ornamental plant by the Victorians but it has now widely naturalized and occurs across the UK.

Japanese Knotweed (spring)  Japanese Knotweed (summer) Japanese knotweed is a vigorous perennial plant that can grow in excess of 3 metres in height and is commonly seen on riverbanks and waste ground. Above and below are pictures of Japanese knotweed growing in at different times of the year. As these pictures indicate, when Japanese knotweed colonises areas, the plant forms dense thickets die back to dead, rigid stems in the winter, only to re-grow more vigorously the following growing season. It is most common and vigorous in open moist sites and occurs along riverbanks, disturbed, wetlands, roadsides and in a variety of disturbed areas.       Japanese Knotweed (winter)   Japanese Knotweed (bamboo like shoots)  Developers R.R.L Invasive Weed Solutions have a guidance pack for developers please contact us for your copy.  For more information download the invasive weed leaflet here