Japanese Knotweed Removal

Japanese Knotweed was first introduced to Europe in the 19th century from Japan and Northern China as an ornamental plant. It was brought to Ireland by the late Victorians.

The plant is very attractive when it is in full flower in the summer time but its rapid growth and relentless spread means that the effect on native species has been often devastating as it out competes indigenous species covering large tracts of land to the exclusion of the native flora and associated fauna.

Japanese Knotweed Ireland - The River Laune in Killorglin Co Kerry

The main means of spread of Japanese Knotweed is via fragmentation of stems and rhizomes and the plants very strong resilient underground rhizome growth. Japanese Knotweed thrives on disturbance, the tiniest piece can regrow and the plant is capable of growing 10cm per day in the growing season, reaching heights of 2/3 metres.

It is a highly invasive weed and is capable of causing structural damage in buildings, foundations, concrete and tarmacadam by exposing weaknesses and growing up through them.

Remember managing Japanese Knotweed is the responsibility of the landowner. It has become a serious threat nationwide, many people are attempting to remove it themselves by cutting or pulling the plant, this will not work as cutting or pulling of any kind actually contributes to its spread – which is against the law!

It is not recommended that people undertake Japanese Knotweed removal and treatment themselves without the assistance of a professional company, who can conduct a site survey and draw up a management plan to best tackle the infestation – most people do not understand how complicated and time-consuming removing Japanese Knotweed can be.

The Japanese Knotweed Company is a leading company with a proactive approach in the area of Invasive plant management and Japanese Knotweed removal.

If you find Japanese Knotweed on your property it needs to be dealt with as soon as possible, if it is ignored and stands of Japanese Knotweed become established it can become very difficult to control.

For instance if a herbicide spraying programme is not carried out correctly – depending on the level of infestation, it may need to be applied over a number of years – then the plant may be put into a dormant state, meaning that it will not actively grow for a time, but after which it will re-grow.

Use of the wrong herbicide increases this risk and makes the spraying a waste of money and your time. The dormancy may last for a couple of seasons but will regrow with as much strength and force as before.

Remember that is illegal to dump Japanese Knotweed waste in the countryside or in garden waste allotments as it just transports the plant to new locations. Plant material should not be composted due to the resilient nature of Japanese Knotweed it could survive and grow on when the compost is ready for use.


It is our experience that there is no one size fits all when determining a Japanese Knotweed eradication strategy as no two infestations are the same, we use a number of different treatment methods or in some cases a combination of a number of Treatment Methods depending on the location of the site, the age of the infestation and other site-specific pressures with regards to timescales, costs and ecological issues.


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