Japanese knotweed

The survey says the climber might be bindweed rather than knotweed. Has a laboratory identification been made?

No laboratory identification has been made. The survey says the climber might be bindweed rather than Japanese knotweed, which is a visual doubt, not a laboratory result. Leaves and growth habit can look alike, especially when the plant is not in flower, and this visit did not send a sample away. The report has not decided which plant is growing. Guidance on invasive plants has not been applied as a finding, because the species itself is still unconfirmed.

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?

Bindweed and Japanese knotweed are different plants with different consequences, and a glance at a stem does not settle which one is present. A laboratory looks at plant material and names it. This inspection did not take that step, did not dig for rhizome, and did not map a stand. Calling the growth a climber that might be bindweed is a limit on what the eye could say. It is not a clearance, and it is not a knotweed diagnosis either.

If you need a name, instruct a specialist who can identify the plant, and ask your solicitor to hold that result apart from this survey. A lender may ask whether knotweed has been identified. The honest answer from this visit is that it has not: the survey only recorded a possible confusion with bindweed. Do not tell anyone the garden is clear, and do not tell them knotweed is present, until an identification exists.

What should you ask your surveyor?

Was any plant sample sent for laboratory identification?
Did the visit dig for rhizome or only look at the climber?
Is the note of possible bindweed being read as a clearance?

What are the typical next steps?

Treat the species as unconfirmed.
Instruct a specialist if you need a laboratory name.
Do not tell a lender the garden is either clear or confirmed knotweed.

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 a green climber on a fence decide the point?

No. A green climber is what the survey saw, and the survey has already said it might be bindweed rather than knotweed. Colour and a climbing habit are not a laboratory identification. The visit did not send a sample. Keep any later identification with your solicitor, separate from this visual note.

Should the seller's word on the plant replace a sample?

No. A seller's description is not a laboratory result, just as this survey's visual doubt is not one either. Ask what they believe the plant is, and whether anyone has already named it in writing. Put that paper with your solicitor. The inspection has not adopted their name and has not produced its own.