03/07/2026
Did you know this toxic plant is found all over the UK?
Giant hogweed (Heracleum mantgazzianum) originally comes from Asia and was brought over as an ornamental. It looks a lot like native cow parsley and can grow up to 5m tall.
It is commonly found near riverbanks, in gardens and allotments adjacent to infested woodland, heathland or common land.
Its clear, watery sap contains toxic chemicals, which sensitises the skin to UV radiation and people who come into contact with it can develop severe burns with blistering.
Essentially it prevents the skin from protecting itself from sunlight, which can lead to very bad sunburn and scarring.
The blisters will form within 48 hours - scars can last for years.
If skin comes into contact with the sap the NHS advice is to cover the affected area, and wash it with soap and water.
If you feel unwell or have a severe reaction you are advised to see a doctor.
In the past, children have been hospitalised due to suffering very severe burns to the skin.
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