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Parish seeks quotes to eradicate suspected Japanese knotweed

Suspected thickets of invasive plant being investigated


Photograph of a suspected thicket of Japanese knotweed close to the North Mymms war memorial on Tollgate Road. Image by North Mymms News released under Creative Commons
A suspected thicket of Japanese knotweed close to the North Mymms war memorial on Tollgate Road

North Mymms Parish Council (NMPC) is obtaining quotes for the eradication of Japanese knotweed after the discovery of what is thought to be thickets of the invasive plant in Gobions Open Space and close to the war memorial. One of the patches is close to the rear gardens on the south side of The Grove in Brookmans Park. The other is on the bank to the north of the North Mymms war memorial close to Tollgate Road.


Photograph of a suspected thicket of Japanese knotweed in the woods in Gobions Open Space close to the back gardens on the south side of The Grove, Brookmans Park. Image by North Mymms News released under Creative Commons
A suspected thicket of Japanese knotweed in the woods in Gobions Open Space
close to the rear gardens on the south side of The Grove, Brookmans Park

A concerned resident, whose garden backs on to the wooded part of Gobions Open Space, has written to this site claiming that North Mymms Parish Council has made "little effort to eradicate the growth of Japanese knotweed" close to his property.

Photograph of a suspected thicket of Japanese knotweed in the woods in Gobions Open Space close to the back gardens on the south side of The Grove, Brookmans Park. Image by North Mymms News released under Creative Commons
Close-up of the plant growing in the woods in Gobions Open Space close to the gardens in The Grove

But council minutes from two meetings held so far this year indicate the local authority is on the case, despite there being no visible evidence of any work having been carried out so far.

The minutes for the council meeting on January 17, 2018, embedded below, record the following statement on page 40:

"A possible presence of Japanese Knotweed has been identified in Gobions open space. Photographs have been emailed to a specialist company for confirmed identification. It will take a few seasons to eradicate. It is not a notifiable issue. Quotes to be obtained for its eradication if positively identified."






A month later, the minutes from the Amenities Committee on February 7, 2018, embedded below, show that a quote had been received but was rejected as being too expensive. References on pages 24 and 26.

"One quote has been received regarding eradicating the knotweed but it was very expensive. A do it yourself method which entails drilling holes in the stems and putting a liquid in to kill the knotweed was discussed but it was agreed that it really needs a licensed contractor to do the job."






Photograph of a close-up of a suspected thicket of Japanese knotweed close to the North Mymms war memorial on Tollgate Road. Image by North Mymms News released under Creative Commons
A close-up of a suspected thicket of Japanese knotweed growing
close to the North Mymms war memorial on Tollgate Road


The minutes from that February meeting continued to set out the action to be taken.

"Possible knotweed has been identified at Gobions Open Space and at the War Memorial.
The Clerk has obtained a quote from www.japaneseknotweed.co.uk for a 5 year treatment. The company will also attend site and carry out a free survey. It was agreed that Councillor Stephen Boulton should be asked to check out the Gobions site and a free survey requested from the company. Councillor Stephen Boulton to confirm presence of knotweed at Gobions. Clerk to request survey to be carried out at Gobions by Japanese Knotweed Company. Clerk to inform Herts County Council, Highways of possible knotweed presence at the War Memorial."

Grid references


The grid reference for the thicket at the North Mymms war memorial site is TL 22353 04705, the grid refererence for the Gobions Open Space thicket is TL 25245 03920.

Expert advice



According to the Royal Horticultural Society: "Japanese knotweed is a fast-growing and strong clump-forming perennial, with tall, dense annual stems. Stem growth is renewed each year from the stout, deeply-penetrating rhizomes (creeping underground stems)."

NNSS, the Great Britain None Native Species Sectretariat, says the plant can have a negative impact on native plant life and the environment. NNSS has issued a flyer about the plant, which goes by the scientific name Fallopia Japonica.






The government has issued guidlines for dealing with Japanese knotweed. The advice says:

"You must prevent Japanese knotweed on your land spreading into the wild. Soil or plant material contaminated with non-native and invasive plants like Japanese knotweed can cause ecological damage and may be classified as controlled waste."

And the financial penalties are steep;

"You could be fined up to £5,000 or be sent to prison for up to 2 years if you allow contaminated soil or plant material from any waste you transfer to spread into the wild."



Copyright


All the images and text above (except in the pdf) are by North Mymms News and are released under Creative Commons BY-NC-SA 4.0.


Have your say 


Have you spotted any Japanese knotweed in the area? If so, please use the comment box below. Contributions will be delayed in appearing because the comments are pre-moderated before they go live.



1 comment:

  1. I first noticed a thicket of Japanese Knotweed growing at the bottom of the garden of the lodge by the bridge to St Marys Church, several years ago. It was growing on the bank adjacent to the river, so no doubt there are now further examples further downstream to Colney Heath and beyond.

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