Japanese knotweed
The agent called a clump of bamboo Japanese knotweed. Why should the survey not copy that name if the plant was not identified?
The survey should not copy the agent's name, because the plant was not identified and bamboo is not Japanese knotweed. An unidentified clump should stay unidentified. The agent's label is not a botanical finding. The inspection can describe the clump, where it stands and that it was not named with any confidence. Promoting a sales word into a knotweed record would state something the visit did not establish. The note, if the plant was not identified, is the clump. It is not knotweed by repetition.
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?
Bamboo and knotweed can both form dense clumps, and a quick label from the path is how mix-ups start. The consequences are not the same. Knotweed carries a particular reporting habit in property forms. Bamboo is a different plant, with its own running habit in some species. If the surveyor did not identify the clump, copying the agent locks in the wrong form. The careful sentence is that a clump was seen and not identified. Identification can be done later. It cannot be borrowed from the brochure.
Ask a person who can identify the plant, and tell the solicitor not to tick a knotweed box on the agent's word alone. If it is bamboo, deal with bamboo. If it is knotweed, the specialist route is different, and the survey has not started that route by refusing the name. Do not let a mortgage form repeat a plant the inspection would not name. Unidentified means unidentified.
What should you ask your surveyor?
- Did you identify the clump, or leave it unnamed?
- Have you kept the agent's knotweed label out of the note?
- Where does the clump stand, so someone else can identify it?
What are the typical next steps?
- Describe an unidentified clump, not Japanese knotweed.
- Do not copy the agent's plant name.
- Have the clump identified before any knotweed form is completed.
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
If the clump is spreading, does spreading make it knotweed?
No. Several plants spread, including some bamboos. Spread is a growth habit, not an identification. The survey has not named the plant. A spreading clump is still an unidentified clump until someone who can tell the species has done so.
Can a photograph in the report be identified later?
A clear photograph can help a later identification. It is not itself the identification, and the survey has not turned the picture into a knotweed record. Someone competent still has to name the plant. Until then the agent's word remains unused.