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   What is giant hogweed?

   • Giant hogweed (Heracleum mantegazzianum) is a plant in the Apiaceae family (previously known as the Umbelliferae). This family includes some well-known plants such as parsley, carrot, parsnip, cumin and coriander. The flowers of giant hogweed are clustered on large, umbrella-shaped flower heads that can be 60 centimetres in diameter. Did you know?

   Giant Hogweed: The Facts - Woodland Trust

   www.woodlandtrust.org.uk/blog/2022/06/giant-hogweed-facts/

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   When does giant hogweed flower?

   • It is in the same family as cow parsley but cow parsley has much finer, fern-like foliage and generally flowers from April to June, whereas giant hogweed tends to flower later in June and July. The flowers are white and held in umbels, (flat-topped clusters, like those of carrots or cow parsley), with all the flowers in the umbel facing upwards.

   Giant hogweed / RHS

   www.rhs.org.uk/weeds/giant-hogweed

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   What does giant hogweed look like?

   • Giant hogweed looks like an enormous cow parsley plant. When it's fully grown, it can reach towering heights of between 1.5m to 5m and have a spread of between 1 and 2m. It forms a rosette of jagged, lobed leaves in the first year before sending up a flower spike in the second year and then setting seed.

   Giant Hogweed: The Facts - Woodland Trust

   www.woodlandtrust.org.uk/blog/2022/06/giant-hogweed-facts/

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   How tall does hogweed grow?

   • “Common hogweed only reaches a maximum height of 2 metres (6ft 7) and the symmetrical flower heads only reach 20cm across. “Its seeds are much smaller and lighter than those of giant hogweed, and the leaves are less jagged and more rounded at the edges than giant hogweed.”

   How to identify giant hogweed and common hogweed difference

   www.forestryjournal.co.uk/news/24331950.identify-giant-hogweed-common-hogweed-difference/

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   Is giant hogweed dangerous?

   • Introduced to the British Isles as an ornamental plant in the 19th century, giant hogweed (Heracleum mantegazzianum) has built itself a fearsome reputation – and for good reason. This enormous member of the umbellifer family contains furocoumarin, which, even after minimal contact, can cause the skin to react strongly to sunlight, leaving burns.

   Giant hogweed guide: how to identify it and how it causes burns

   www.countryfile.com/wildlife/trees-plants/giant-hogweed

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   Where did hogweed come from?

   • It's thought giant hogweed was first introduced to Britain in 1817, when seeds were sent from Russia to Kew Gardens. The carrot family member, known as Heracleum giganteum, was originally found in the Caucasus, and is part of the Apiaceae family, which includes popular herbs such as parsley and coriander.

   How to identify and get rid of Britain’s ‘most dangerous plant’

   www.standard.co.uk/news/uk/what-is-giant-hogweed-identify-toxic-plant-a4439801.html

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2. www.woodlandtrust.org.uk › 06 › giant-hogweed-factsGiant Hogweed: The Facts - Woodland Trust

   www.woodlandtrust.org.uk › 06 › giant-hogweed-facts

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   Jun 29, 2022 · Common names: giant hogweed, giant cow parsnip, cartwheel plant, the Hog. Scientific name: Heracleum mantegazzianum. Family: Apiaceae. Habitat: derelict gardens, neglected urban places and waste ground, on rubbish tips, roadsides and by streams and rivers. Flowering season: June and July.

3. www.rhs.org.uk › weeds › giant-hogweedGiant hogweed / RHS

   www.rhs.org.uk › weeds › giant-hogweed

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   Giant hogweed (Heracleum mantegazzianum) is tall with thick bristly stems that are often purple-blotched. It is in the same family as cow parsley but cow parsley has much finer, fern-like foliage and generally flowers from April to June, whereas giant hogweed tends to flower later in June and July.

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5. www.forestryjournal.co.uk › news › 24331950How to identify giant hogweed and common hogweed difference

   www.forestryjournal.co.uk › news › 24331950

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   May 20, 2024 · This is how to identify giant hogweed, from its stems, leaves and flowers - see the difference between common hogweed, according to Woodland Trust.

6. www.gardenersworld.com › giant-hogweedWhat is Giant Hogweed? | BBC Gardeners World Magazine

   www.gardenersworld.com › giant-hogweed

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   Aug 22, 2024 · Giant hogweed (Heracleum mantegazzianum) is a non-native, invasive weed. Native to southern Russia, it's a member of the Apiaceae family and is closely related to cow parsley, carrots and parsnips.

   • Author: BBC Gardeners' World Magazine

7. Videos

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     How To Identify Giant Hogweed

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     How to Spot Giant Hogweed & What to Do

     5 Aug 2015

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     How to Identify Giant Hogweed – An Invasive and Noxious Plant

     28 Jun 2021

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8. www.rhs.org.uk › advice › profileGiant hogweed - RHS Gardening

   www.rhs.org.uk › advice › profile

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   Giant hogweed (Heracleum mantegazzianum) is tall with thick bristly stems that are often purple-blotched. It is in the same family as cow parsley but cow parsley has much finer, fern-like foliage and generally flowers from April to June, whereas giant hogweed tends to flower later in June and July.

9. www.countryfile.com › trees-plants › giant-hogweedGiant hogweed guide: how to identify it and how it causes burns

   www.countryfile.com › trees-plants › giant-hogweed

   This enormous member of the umbellifer family contains furocoumarin, which, even after minimal contact, can cause the skin to react strongly to sunlight, leaving burns. Learn how to identify giant hogweed using its leaves, flowers and stem with our species guide.

10. www.standard.co.uk › news › ukWhat is giant hogweed? Girl left ‘scarred for life’ by ...

    www.standard.co.uk › news › uk

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    Sep 8, 2023 · What is giant hogweed? Experts have said giant hogweed is “Britain’s most dangerous plant”. It's thought giant hogweed was first introduced to Britain in 1817, when seeds were sent from...