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

    MAP KEY:

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

    UK Map