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Giant Knotweed

Giant Knotweed

What is Giant Knotweed?

Giant knotweed (Fallopia Sachalinensis) is a striking and very large plant, forming stands of largely un-branched stems and 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.

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.

Identification

Think you could have Giant Knotweed on your land? Click here to identify Giant Knotweed.

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Japanese knotweed growing in front of houses in London

RESIDENTIAL

Do you have Japanese Knotweed? Has your buyer’s mortgage been refused? TCM supply eradication solutions for homeowners.

Japanese knotweed rhizome

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Howard Downer, MD of TCM Ltd

THE EXPERT DR. KNOTWEED

Howard Downer, AKA Dr. Knotweed, has over 20 years of experience as an Environmental Consultant and is regarded by his peers as one of the most knowledgeable people in the Japanese knotweed industry.

Follow Dr. Knotweed to hear of about the latest developments regarding Japanese knotweed and the implications of infestation.

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