Japanese knotweed
An older survey in the pack names knotweed and this inspection in autumn saw none. Why does the older sentence not get deleted by a season without leaves?
The older sentence does not get deleted because autumn without leaves is a poor moment to erase a named plant. Knotweed dies back. This inspection saw no canes. That is what this visit found, in the season it was made. It has not contradicted the older survey out of existence, and it has not certified that the plant is gone. A season without leaves hides the growth the older sentence was about. The pack now holds both: a previous naming, and a later visit that saw none.
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?
Above-ground stems are not the whole plant. After they brown and fall, the ground can look ordinary while rhizome remains. An autumn inspection that sees bare soil is reporting the bare soil. It is not a summer search repeated. The older survey, if it truly identified knotweed, remains evidence of what someone found then. Deleting it would pretend the earlier inspection did not happen. The honest reading is a conflict of seasons and of documents, not a clearance.
Show both documents to the solicitor and ask what the seller's knotweed replies say. Do not strike the older sentence because this visit was quiet. If you need a current view of whether the plant is present, instruct a specialist who will say what autumn can and cannot show. The home survey has not overwritten the earlier report. Both papers stay in the pack.
What should you ask your surveyor?
- Did this visit see no knotweed growth, without deleting the older report?
- Was the inspection in a season when leaves would be a poor guide?
- Have you left the older naming in place as a document in the pack?
What are the typical next steps?
- Keep the older knotweed sentence and this autumn note side by side.
- Ask the solicitor what the seller has said about knotweed.
- Do not treat a leafless visit as a deletion of the earlier report.
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 older survey was wrong, can this visit correct it?
Only by recording what this visit saw, which was no canes in autumn. That does not prove the older survey was wrong, and it does not prove it was right. A correction of an identification needs evidence the plant was misnamed. Bare ground in autumn is not that evidence.
Does winter die-back count as treatment?
No. Die-back is what the plant does as the year turns. It is not a herbicide programme and it is not a guarantee. The survey saw no leaves. It has not described a treatment, and the older sentence is still in the pack.