Japanese Knotweed

Japanese Knotweed (Fallopia Japonica) is a large herbaceous perennial native to Eastern Asia. It was introduced to Britain in the 1850’s as an ornamental plant. It is now listed by The World Conservation Union as One of the Worlds WORST Invasive Species.

Japanese Knotweed is very resilient vigorously resprouting from the roots (rhizomes). It can grow up to 4m High and 3m Deep with with the complex root system spreading 7m. It can also grow up to 10cm in a day.

It has no benefits to Wildlife and will overtake native plant species. Japanese Knotweed has no boundaries and can grow through Concrete, Brickwork and Tarmac causing damage to Drainage Systems, Buildings and Structures.

Japanese Knotweed in the Summer

Japanese knotweed where did it originate and what was it brought to Britain for?

Japanese Knotweed is native to Japan but also Taiwan and China in Eastern Asia. It was introduced to Britain between 1821 and 1845 as an ornamental plant and also used as cattle fodder. Initially it was most prevalent in South Wales, perhaps due to the moist climate, but it is now widespread throughout the UK and can be found growing extensively alongside railways, canals, rivers, streams and roadsides. Experts have estimated it costs the country £166 million annually.

 

Why is Japanese knotweed a problem?

When Japanese Knotweed comes into contact with homes and properties it causes a number of problems. As the invasive rhizome (or root) of Japanese Knotweed can extend up to 3m in depth and 7m in all directions, the major problems construction can face and the devastating consequences to building foundations and drains are all too apparent.

In addition to these issues, a Japanese Knotweed infestation can seriously hinder chances of selling your property in the future if apparent and not being treated with mortgage providers reluctant to lend against a property that has infestation present.

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