Giant Knotweed

What is Giant Knotweed?

Giant knotweed (Fallopia Sachalinensis) is a striking and very large plant forming stands of largely un-branched stems, bearing leaves up to 3 times larger than those of Japanese Knotweed. These are reminiscent of the foliage of the broad-leaved dock, Rumex Obtusifolius. The flowering of both male and female plants starts later than Japanese knotweed, and flowering is less prolific.

This plant is native to the island of Sakhalin to the north of Japan, and the remote island of Ullung-do between Japan and Korea.

Knotweed Removal Solutions

The vast knowledge and many years experience the TCM Knotweed team possess means that we can provide the most effective and efficient Knotweed removal solutions for both commercial and residential landowners.  If you are concerned about the presence of Giant Knotweed at your location, please contact TCM to arrange for a site visit, and to discuss your treatment options.

Why is Giant Knotweed a problem in the UK and Ireland?

Giant knotweed spreads by the extension of the rhizome system and is mainly dispersed by the transport of portions of rhizome to fresh sites. However, it has not shown the destructive competitiveness of Japanese Knotweed.

The role of true Giant knotweed seedlings in the spread of the plants in the UK has received little discussion, though it is likely to be insignificant. Substantial genetic diversity in the plants has been noted, though this is likely to have arisen through multiple introductions of the species from various parts of the native range, rather than through home-produced seedlings.

Giant knotweed’s true significance is as the main pollen parent of the hybrid, Fallopia X Bohemica, whose hybrid vigour may render it the greatest threat, so far, of all.