Japanese knotweed and any soil containing it are classed as controlled waste, so how you dispose of it is governed by law rather than left to choice. Cut canes, dug-out rhizome and contaminated soil must go to a licensed facility under a waste transfer note, and they must not be composted, binned or fly-tipped. Our guide to the law on knotweed sets out the duty of care behind this, and getting disposal wrong risks both spreading the plant and breaching the rules.
How do you dispose of Japanese knotweed legally?
You dispose of Japanese knotweed legally by treating it as controlled waste under the Environmental Protection Act 1990, sending cut material, rhizome and contaminated soil to a permitted landfill or licensed facility, accompanied by a waste transfer note that records what moved and where. It cannot go in the household or garden bin, be composted, or be dumped, because a fragment can start a new stand. A professional removal handles this as part of the job, using registered waste carriers and keeping the paperwork.
Why is knotweed controlled waste?
Knotweed is controlled waste because a piece of rhizome the size of a fingernail can regrow, so uncontrolled disposal spreads it to new sites, roadsides and watercourses. The Environmental Protection Act 1990 classes both the plant and any soil containing it as controlled waste, and section 34 places a duty of care on whoever holds it to ensure it is transferred only to an authorised person and properly documented. That is why licensed disposal, not the garden bin, is the only lawful route once knotweed is cut or dug.
What is a waste transfer note?
A waste transfer note is the record that must accompany any transfer of controlled waste, describing the waste, its quantity, who handed it over and who received it, and it must be kept for at least two years. For knotweed it evidences that the material went from your site to a licensed facility through a registered carrier, satisfying the section 34 duty of care. Keeping it matters, because it is the proof that disposal was lawful if the movement of waste is ever questioned.
Can I bury or burn it instead?
On-site burial is only lawful in specific, engineered circumstances, such as cell burial to a defined depth wrapped in a root barrier membrane, carried out by a specialist and usually notified to the regulator, not a matter of digging a hole. Burning does not deal with the rhizome and any surviving soil remains controlled waste. Because the rules are strict and getting it wrong spreads the plant or breaches them, on-site options are best handled as part of a professional treatment plan.
Common questions
- Can I put knotweed in my garden waste bin?
- No. Knotweed is controlled waste and must not go in household or garden collection, which would risk spreading it. It has to go to a licensed facility under a waste transfer note, usually via a professional.
- Is it illegal to move knotweed soil?
- Moving contaminated soil off site without treating it as controlled waste breaches the duty of care and can spread the plant. Soil containing rhizome must be disposed of lawfully or dealt with on site under a plan.
- Who keeps the waste transfer note?
- Both parties to the transfer should keep a copy for at least two years. Where we carry out removal, we retain the documentation as evidence that the material went to a licensed facility.