Japanese Knotweed - Reynoutria japonica


Vigorous, spreading, tall plant with stout erect stems to 2 metres. Stems can be bluish-green or reddish in colour, branched above. Leaves broadly oval, triangular, stalked. Flowers white, in narrow leafy panicles from upper leaf joints.

Identification difficulty

Moist habitats, grassy banks, waste ground, roadside verges etc.

When to see it

August to October.

Life History


UK Status

Fairly frequent now over much of Britain except the far north.

VC55 Status

Fairly frequent (often invasive) in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 122 of the 617 tetrads.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map