 Taff's Well and Nantgarw Allotments and Community Garden Project | sitemap | log in
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Japanese Knotweed Threat to Allotment Site 26 May 2010 Japanese Knotweed Threat to Allotment Site  Following concerns that Japanese knotweed had been found in the allotment car park, the Community Council contacted the County’s Invasive Species Officer for advice on how to deal with the problem.
We were informed that Japanese knotweed is listed by the World Conservation Union as one of the world’s most invasive species with stems that can grow 3-4 metres in an incredibly short time. The plant is so strong that its root system can damage foundations, buildings, paving and retaining walls. However, in the “growing season” the stems should not be cut back as this strengthens the root system and increases the spread of the knotweed.
Fortunately, the officer has agreed to include the allotments as part of this year's Japanese Knotweed treatment programme.
It is planned to start the treatment programme end of August finishing in October. The approach requires 3 treatments - 1 treatment a year.
If all goes well next year's re-growth should only be a tenth of what it currently is and in year 3 the knotweed should be eradicated.
PLEASE REMEMBER DO NOT CUT THE KNOTWEED BACK OTHERWISE IT WILL SPREAD THROUGHOUT THE ALLOTMENT.
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