Japanese knotweed (Fallopia japonica) or Japanese bamboo is a tall herbaceous perennial plant with bamboo like stems which can grow up to 10cm a day.
It often grows in dense thickets. The mature stems are speckled purple; with young stems growing in zig-zags. Leaves are shield-shaped, alternate along the stem and can grow up to 15cm (6 inches) long. They are often a distinctive, uneven pale yellowy-green colour when mature. Dead stems persist throughout the winter.
Japanese knotweed is common in urban areas, particularly on waste land, railways, road sides and river banks.
Infestation is widespread and common thoughout the whole of the UK.
Japanese knotweed outcompetes native plants and once established is extremely difficult to eradicate. It can cause major structural damage to roads and houses, even growing through asphalt and concrete, and in some instances the presence of Japanese knotweed can lead to mortgage applications being refused.
Japanese knotweed spreads rapidly in the wild, solely by vegetitive means from either fragments of rhizome (root) or stem.
Please do not strim, shred or attempt to compost this plant!