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Giant hogweed looks like very large cow parsley, with a pale, swollen rootstock. 20-50,000 viable seeds a year from each plant can be dispersed over short distances by wind but considerably longer distances by rivers and streams (see picture nos. 1 & 8).
Giant Hogweed grows quickly and dominates river banks and aquatic ecosystems threatening human health and native species as well as eroding riverbanks which is why we need your help!
- 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.
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.
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.
identify the plant and if confirmed as giant hogweed, develop an eradication plan. 1. Consult the Identification section above and the additional resources listed below for initial identification. 2. If you believe you have giant hogweed, take pictures of identifying characteristics (flower such that the flower rays can be counted, a
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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.
Invasive Species Guide: Giant Hogweed Photos are sourced from GBNNSS, Tom Richards and RPS group Plc. Mechanical Control: Large populations of Giant Hogweed can be controlled using cutting methods to prevent populations from seeding but provides no long term solution as the plant can rapidly regrowth from below ground.
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Species Description. Scientific name: Heracleum mantegazzianum AKA: Efwr enfawr (Welsh) Native to: Caucasus mountains in south west Russia and Georgia. Habitat: Widespread, most common on river...
