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   Are giant hogweed invasive?

   • General impact: Giant Hogweed is a vigorous and widespread invasive species in Britain, which also poses a health risk to the public. This plant is often associated with riparian habitats, where waterways can provide corridors along which it can spread.

   GOOD PRACTICE MANAGEMENT - Invasives.ie

   invasives.ie/app/uploads/2021/09/RAPID_Good_Pratice_Management_Giant_hogweed_EN.pdf

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   Is giant hogweed dangerous?

   • Giant hogweed is a serious threat to human health. All parts of the plant contain varying amounts of furano-coumarins, which can produce phyto-photodermatitis (sensitive reaction to light) on contact with exposed human skin. This results in a red rash and blistering within 24-48 hours of contact, which can be serious.

   Management of Giant Hogweed - PCA Technical Document

   www.property-care.org/write/MediaUploads/News/Documents/Management-of-Giant-Hogweed-PCA-Guidance-Note.pdf

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   Can giant hogweed cause burns?

   • In short - the sap of giant hogweed can cause burns. It contains furocoumarin, which makes skin extremely sensitive to sunlight (phytophotodermatitis). If the sap gets onto your skin and it's then exposed to the sun, your skin can blister badly. Blistering can then recur over months and even years. This is known as phytotoxicity.

   Giant Hogweed: The Facts - Woodland Trust

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

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   Can hogweed be a nuisance?

   • There is provision within Common Law to take civil action against neighbouring landowners where the spread of giant hogweed is considered to be a private or public nuisance. The flowers of a single umbel can produce 30,000 to 50,000 viable seeds.

   Management of Giant Hogweed - PCA Technical Document

   www.property-care.org/write/MediaUploads/News/Documents/Management-of-Giant-Hogweed-PCA-Guidance-Note.pdf

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   Can giant hogweed spread in the UK?

   • It is illegal to plant or deliberately allow giant hogweed to spread in the UK. At a garden scale, individual plants can be removed by hand but this must be done in full protective clothing due to the danger posed by the sap. The best way to get rid of giant hogweed is to dig out the whole plant in spring before it flowers and sets seed.

   Giant Hogweed: The Facts - Woodland Trust

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

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   How does giant hogweed affect native plants?

   • Giant hogweed can form dense colonies which suppress the growth of native plants, including grasses, dis-placing species and negatively impacting ecologically sensitive and vulnerable habitats.

   Management of Giant Hogweed - PCA Technical Document

   www.property-care.org/write/MediaUploads/News/Documents/Management-of-Giant-Hogweed-PCA-Guidance-Note.pdf

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2. www.property-care.org › write › MediaUploadsPCA Guidance Note - Property Care

   www.property-care.org › write › MediaUploads

   WARNING: The sap of giant hogweed contains a toxic chemical which sensitises the skin and leads to severe blistering when exposed to sunlight. THIS REACTION CAN RECUR FOR MANY YEARS. See Appendix 1 on avoiding health hazards and dealing with blistering and rash.

3. 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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   • Stems
   • Leaves
   • Flowers

   Green and often with purple blotches and stiff, white, bristly hairs. Stems are hollow with ridges and have a thick circle of hairs at the base of each leaf stalk.

   See full list on woodlandtrust.org.uk

   Huge, up to 1.5m wide and 3m long, deeply divided into smaller leaflets. It looks a bit like a rhubarb leaf, with irregular and very sharp or jagged edges - which has given rise to one of its other common names - wild rhubarb. The underside of the leaf is hairy.

   See full list on woodlandtrust.org.uk

   Appear in June and July. They are small and white (or slightly pink) and are clustered on umbrella-like heads known as umbels that can reach a diameter of 60cm. All the flowers on the umbel face upwards.

   See full list on woodlandtrust.org.uk

4. Videos

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     Giant Hogweed - A public safety video

     22 Jun 2018

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     Hogweed is one of Canada's most dangerous plants, here's what you should know

     15 Jun 2021

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     Dangers of giant hogweed plant

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5. conservationlandservices.co.uk › resources › theThe Perils of Giant Hogweed: What Problems It Causes for UK ...

   conservationlandservices.co.uk › resources › the

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   Health Hazards. One of the most alarming issues with giant hogweed is its serious health risks. The plant’s sap contains furanocoumarins, which react with sunlight to cause severe skin burns and blisters. Even brushing against it can lead to painful, long-lasting scars.

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

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

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   Although there is no statutory obligation for landowners to eliminate giant hogweed, local authorities will often take action to remove infestations in public areas. Plants that are undesirable, out-compete desired plants, or simply invade half the garden are classed as weeds and require control.

7. invasives.ie › app › uploadsGOOD PRACTICE MANAGEMENT - Invasives.ie

   invasives.ie › app › uploads

   General impact: Giant Hogweed is a vigorous and widespread invasive species in Britain, which also poses a health risk to the public. This plant is often associated with riparian habitats, where waterways can provide corridors along which it can spread.

8. www.invasivespeciesireland.com › wp-contentThe Giant Hogweed Best Practice Manual - Invasive Species Ireland

   www.invasivespeciesireland.com › wp-content

   species that are having severe negative impacts on a variety of ecosystems. Giant Hogweed and other invasive alien plants are leading to a reduction in local plant biodiversity. Additionally, they can cause considerable economic damage, sometimes also presenting a health hazard to humans. No universal

9. invasivespeciesscotland.org.uk › giant-hogweedGiant Hogweed (Heracleum mantegazzianum) | Invasive Species ...

   invasivespeciesscotland.org.uk › giant-hogweed

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   Giant Hogweed is a public health hazard as the toxins in the sap react with sunlight/UV ray causing the skin to blister and severe scarring. Can block access and rights of way Seed dispersal particularly by water