Be aware of Giant hogweed and avoid contact Date published: 20 May 2024 Be aware of Giant hogweed and avoid contact with it, as it can cause blistering and swelling on the skin. The plant is usually found growing in areas of damp soils, such as river banks. ContentsSkip table of contentsGiant hogweedWhat to do Giant hogweedGiant hogweed(external link opens in a new window / tab)external link opens in a new window / tab grows up to between three and five metres high, which is what helps identify it as it looks similar to hogweed and cow parsley.You should report any sightings(external link opens in a new window / tab)external link opens in a new window / tab of the plant.Giant hogweed contains a sap which irritates skin when it is exposed to sunlight.Symptoms are usually noticeable within 24 hours and include blistering and swelling on the skin, which may be made worse by over-exposure to the sun.What to doIf you come into contact with Giant hogweed: cover the affected skin immediately to avoid exposure to the sun wash the skin with cold water If there is blistering or the contact was with the eyes, you should seek medical advice.More useful links Invasive plants Invasive aquatic plants Controlling pests and weeds Invasive Species Northern Ireland(external link opens in a new window / tab)external link opens in a new window / tab Share this page Share on Facebook (external link opens in a new window / tab) Share on Twitter (external link opens in a new window / tab) Share by email (external link opens in a new window / tab)