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Japanese knotweed (Fallopia japonica) is a weed that spreads rapidly In winter the plant dies back to ground level but by early summer the bamboolike stems emerge from rhizomes deep underground to shoot to over 21m (7ft), suppressing all other plant growthThere is no mistaking a wellestablished stand of Japanese knotweed for any other plant in PA except for its close kin, giant knotweed (Polygonum sachalinense) Both knotweeds grow in tall, dense stands that shade out other vegetation Both have large, handsized, heartshapedIn its native habitat, Japanese Knotweed is a pioneer species found typically on Volcanic Iarva Reproduced rapidly via tiny fragments of its rhizome, the weeds of Japanese Knotweed can grow up to 10cm a day and in just 10 weeks its stems can reach 34 metres in height Related Where is Japanese knotweed in the UK? How To Remove Japanese Knotweed Japanese knotweed removal