Invasive non-native species such as Japanese knotweed, giant hogweed, and Himalayan balsam are commonly found on UK construction sites. Spreading these species through soil movement or contaminated equipment is a criminal offence. Giant hogweed also poses a direct health risk causing severe chemical burns. This talk explains how to identify the most common invasive species on site and the legal requirements for control.
Key Hazards
Criminal prosecution for causing the spread of listed invasive species
Severe skin burns from giant hogweed sap activated by sunlight exposure
Project delays and costs from invasive species discovered during construction
Contaminated soil spread to clean areas by plant, vehicles, or material movements
Control Measures
Learn to identify Japanese knotweed, giant hogweed, and Himalayan balsam from site ecology briefings.
Report any suspected invasive species immediately to the site environmental manager.
Do not cut, strim, or disturb any plant you suspect may be an invasive species without expert advice.
Avoid skin contact with giant hogweed sap — wear full-length clothing and gloves near suspect plants.
Keep contaminated soil containing invasive plant material within a designated quarantine area.
Clean all plant, vehicles, and equipment tracks before moving from areas with invasive species present.
Dispose of invasive species waste only at a licensed facility authorised to accept controlled waste.
Follow the invasive species management plan prepared by the project ecologist for the site.
Ensure excavated soil from infested areas is not reused or moved without ecologist approval.
Remember
Learn to identify Japanese knotweed, giant hogweed, and Himalayan balsam on construction sites
Report any suspected invasive species to the site environmental manager immediately
Never cut, strim, or disturb a suspected invasive plant without expert ecological advice first
Avoid all skin contact with giant hogweed sap as it causes severe burns when exposed to sunlight
Clean plant and vehicle tracks before leaving areas where invasive species are present
Contaminated soil must not be moved or reused without approval from the project ecologist