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Disposal of knotweed and soil containing rhizome

Fly-tipping of green waste on road verges, lay-bys and waste ground has been a major cause of knotweed spread, as well as that of many other non-native invasive plants. This activity is illegal and highly damaging to the environment.

If you witness an individual fly-tipping waste, you should note the vehicle type and registration, the time, date and location, and any additional details concerning the individual involved. This information should then be provided to the Environment Agency on the 24-hour freephone hotline, 0800 807060.

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If you spread knotweed outside your property you may be liable to prosecution (see Japanese Knotweed and the Law.)

If you have knotweed within the curtilage of your property, you should kill it rather than crop it.

The best option is always to deal with the plant within the site where it is situated. 

Control using herbicide is an appropriate method to reduce the amount of material which you need to deal with. 

Whenever considering disposal, the following should be taken into account.

  • If you wish to burn the material you should contact the Environmental Health Office of your local council and ask advice regarding legislation concerning garden bonfires.
  • All parts of the plant should be thoroughly dried, preferably across material such as a corrugated sheet so that there is maximum air circulation on all sides. Precautions must be taken to ensure no parts of the plant are spread from the drying location. Following the drying process, if permitted on the site, burning is best carried out within a semi closed vessel such as a garden waste incinerator, to ensure complete combustion of all the material.  

Cornwall Council has an arrangement whereby private residents may take Japanese knotweed material, double bagged, to their nearest Household Waste Disposal site. Please ring 08456 300300 before taking the plant to the disposal site. An operative on the site must be informed of the type of the material to ensure that it is appropriately separated for appropriate disposal and not put with material for composting, as parts of the plant may be capable of surviving the composting process and thus contaminate the end product. 

For further information on the disposal of knotweed please see the hauliers duty of care page and our route maintenance and vehicle recovery workers page.

 © Cornwall Knotweed Forum.

The information on these pages has been compiled by the Cornwall Knotweed Forum from information provided by its members and partners. It is provided in good faith to the raise awareness of the issues and to promote best practice in the control of Japanese knotweed. The information may be used freely for private and educational purposes but may not be copied for commercial use. We update information and advice on a regular basis. However the Cornwall Knotweed Forum, or any of its constituent members cannot be held responsible for the efficacy of the treatments described, or any damage to persons, property or the environment that arises from interpretation of the advice given.

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