General information

Client: commercial.

Location: Oldham.

Area under treatment: over 100 sq. metres.

Technique: spraying of herbicide.

Status: in progress.

The client’s property is a disused pub that is being converted into residential flats. Japanese knotweed grows at the back of the client’s land and on the side and back of neighbouring properties. The client decided to put a management plan in place to eradicate Japanese knotweed to facilitate the sale of the flats in the future.

Survey results

Japanese knotweed stands over 2 metres tall and densely populated on top of the retaining wall in front of the building.

Japanese knotweed was also present on the land of the privately owned neighbouring property.

As the knotweed was located within a distance of 7 metres from the habitable space (the disused pub building), a management plan to treat Japanese knotweed was formally required. A three-year treatment plan followed by two-year monitoring was agreed with the client.


A weed-killer was applied by spraying during year one behind the client’s building.

And near the neighbour’s house.

As revealed during the site visit in year 2, shown in the next two photographs, most of the area was successfully affected by treatment in year 1.

As the knotweed stand was relatively dense during the survey, some minor regrowth was observed at the end of the growing season of year 2.

The treatment will be continued later this year as scheduled.