Japanese knotweed, Fallopia japonica
, was introduced to the UK by the Victorians as an ornamental plant. But because of its rampant growth, and the fact it aggressively over-runs anything in its path, it's now an offence to plant this in the wild. It spreads by sprouting from thick, woody rhizomes, and can grow 1.2m in one season. Winter is the only time of year that offers a reprieve, but for the rest of the year it's a plant that needs tough handling as soon as it appears.
This weed is especially rampant and can grow to 2.1m in just one season, overwhelming any garden plants in its way. It doesn't colonise gardens by producing seeds, instead it sprouts from very small sections of rhizomes.
Find it on
all over the garden