Buddleia is responsible for more structural damage than Japanese knotweed. By Paolo Martini on 2nd July 2019 (updated: 8th January 2020) in News. Seeds (if produced) are spread mainly by wind. 21/03/2019; 2 MIN READ; While it is one of the more attractive weeds, Japanese knotweed, or Fallopia japonica, is also one of the most troublesome and problematic weeds in Edinburgh. Seeds can grow in the smallest of cracks, without access to soil, and will develop large woody root networks that damage the structures from within.

Even after herbicide treatment has “eradicated” the aerial and surface growth, the deep underground rhizomes can remain in a viable state and may do so for up to twenty years. Japanese Knotweed (sometimes spelt Japanese Knot weed) is a non-native, alien invasive plant species, originally from Japan & Northern China and it was first introduced to Europe in the 19 th Century.. Japanese Knotweed was first introduced to Britain by the Victorians as an ornamental plant – and was actually awarded a gold medal at a prestigious flower show.
The most common method of dispersal is by means of stem, crown and rhizome (underground stem) sections. Reynoutria japonica, synonyms Fallopia japonica and Polygonum cuspidatum, is a large species of herbaceous perennial plant of the knotweed and buckwheat family Polygonaceae. Can Japanese knotweed spread by cross-breeding? News Japanese knotweed removal & eradication in Edinburgh – call Kleerkut. Japanese Knotweed is available as an ornamental plant in Ontario, and can be spread to new areas from gardens. Japanese Knotweed. Where can I buy live Japanese Knotweed or seeds? Japanese knotweed is an invasive and resilient weed. Japanese knotweed can produce seeds, but it is extremely rare for these seeds to germinate. This invader is very persistent and once it becomes established, is incredibly difficult to control.

Japanese knotweed is a hotly debated topic in Parliament, within the property industry and in the courts, however, a positive identification of the plant is required before any legal action is started. If you have it, can I buy it off you? Photo courtesy of Ken Towle.

Japanese knotweed does not spread via cross-breeding. How To Identify Japanese Knotweed. Whilst seeds of the plant may be produced by Japanese knotweed here, these seeds are sterile and will not lead to new growth. Japanese knotweed is especially persistent due to its vigorous root system, which can spread nearly 10 metres from the parent stem and grow through concrete and asphalt.
Its roots and rhizomes can grow to a depth of 2m. This variety features medium sized green leaves and very ornamental pink flowers that tend to develop in clusters. It can re-emerge and re-grow on its own accord at any time and especially if the contaminated ground is disturbed.