Japanese knotweed

Can you compost or bag an invasive plant with ordinary garden waste after a survey flags it?

No. GOV.UK says you must not plant invasive non-native plants in the wild or cause them to grow in the wild, which can include moving contaminated soil or cuttings. It also says you cannot compost most of these plants, because they survive composting. Japanese knotweed has its own page: do not put it in the green waste. A home survey does not give you permission to clear the bed.

Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.

What is the fuller explanation?

The survey’s job is to say what it saw or what it suspects. The disposal rules sit with you once you own the site, and with the seller if they start digging before completion. Bagging canes into a neighbour’s skip is spreading. Burial and burning have conditions on the GOV.UK invasive-plant page. This page will not shorten those conditions into a method.

A specialist who removes knotweed should say where the material will go. There is no RICS price for that removal. Do not accept a gardener’s day rate that ends in the council green bin. If the survey only said “weed, not identified”, do not treat it as knotweed and do not treat it as safe to compost either until someone names it.

What should you ask your surveyor?

Did you identify the plant, or only say it should not be ignored?
Are you authorising removal? You should not be.
What should the solicitor ask the seller not to do before completion?

What are the typical next steps?

Tell the seller not to clear the area into ordinary waste before you have advice.
If you need it gone, ask a specialist where the waste will go.
Do not compost it, burn it or bury it from this page.

Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.

Also asked about this

Does the rule apply only to knotweed?

Knotweed has its own guidance. GOV.UK’s invasive-plant page covers the wider duty not to cause those plants to spread, including by moving soil and cuttings.

Can the surveyor take a cutting away to identify it?

They should not walk off with plant material. Identification should not spread the plant.