Where ever Giant Hogweed is identified, it should be reported to local authorities so it can be removed before it begins to spread. A single plant germinating from a single seed could start a significant invasion. Walkers who may brush against it, or gardeners who may unwittingly strim the plant getting the sap on themselves. © 2020. It is a garden ornamental from southwest Asia that is naturalizing in North America and becoming more common in southern and central Ontario. Giant Hogweed is mainly a danger for children who may well use the long stems to play with as swords, pea shooters or telescopes. Here is some information to assist you in accurately identifying cow parsnip and giant hogweed. Giant hogweed (Heracleum mantegazzianum), is a tall, cow parsley -like plant with thick bristly stems that are often purple-blotched. Official web site of The City of Calgary, located in Calgary, Alberta, Canada. Giant hogweed is susceptible to systemic herbicides, such as glyphosate and triclopyr. The Giant Hogweed plant is found in many provinces and in many States. This has raised local public concerns and interest in the plant. plant. Visit the Oregon Department of Agriculture's Giant Hogweed Identification site for more information on the differences in giant hogweed and cow parsnip. It is highly recommended to review the information on the giant hogweed to confirm a positive sighting in Calgary. Thanks very much folks for your reports. Giant Hogweed is suspected in the Yukon. Giant hogweed is a member of the parsley or carrot family and was first introduced to North America as a garden ornamental. A couple of key features can be used in differentiating the two. The application of these herbicides is considered effective and cost efficient and can be used for the control of a single plant or large stands of giant hogweed. Aside from its immense size, giant hogweed is also distinguished by its stout, dark reddish stem that can grow 5 cm to 10 cm in diameter. Giant Hogweed is an invasive weed species that can cause skin irritation, blistering and burning upon contact. It is not present (yet), in Alberta, Saskatchewan, Manitoba, PEI, North West Territories, and Nunavut. Under ideal conditions, a plant can reach a height of 5.5 m (18 ft 1 in). Large colonies of giant hogweed shade out and eventually exclude the shorter native plants with the resultant loss of dependant insects and other animals. Positive sightings can be reported to 311 or 403-268-CITY (2489) if calling from outside Calgary.​​​, Learn more about common pests in Calgary​. Risk Management and Hazard Assessment, 08. Giant hogweed has the potential to spread readily and grows along roadsides, ditches and streams. The Giant Hogweed is a member of the Apiaceae family and is native to Central Asia. It was used as an ornamental garden plant and its seeds were used in cooking. Hydrofluoric Acid and Calcium Gluconate Gel, 25. The main difference is the height and the fact that it can cause serious burns to the skin. Lab Closeout or Lab Renovation Procedures, 13. Giant hogweed, Heracleum mantegazzianum, which has been featured recently in national media reports, is one of the new invasive alien plants designated as Prohibited Noxious under Alberta’s newly revised Weed Control Act. https://www.invasiveweedsolutions.co.uk/.../non-native/giant-hogweed Giant hogweed can grow to more than 4 metres tall, with flower umbels that can reach 2 feet in diameter. Virginia Tech researchers who helped identify the dangerous Giant Hogweed plants in Clarke County, Virginia, want residents to stay on the lookout for the plant with toxic sap that can cause severe burns — but also stressed that the weeds are believed to have been planted intentionally decades ago and haven’t spread in the years since. Giant Hogweed is suspected in the Yukon. Stems are green with ridges and fine fuzzy white hairs. Giant hogweed looks extremely similar to another plant species found in Calgary - cow parsnip. Below are two links to information about Giant Hogweed. Link to Youtube, Giant Hogweed Identification and Comparison with Cow Parsnip Giant hogweed - brought to England from Asia in the 19th century - is a relative of native cow parsley that grows up to 23ft high. ~ Giant hogweed is a good competitor as its leaves grow early in the season and it shades out lower growing species. Plants can grow as high as two to five and a half metres (15 to 18 feet). It is an invasive, alien plant that originates from the Caucasus Mountains in west central Asia where it grows in subalpine meadows and forest edges. The lower leaves are often 1m more in size and distinctively spiky. Similar-looking cow parsnip does not burn the skin but can cause mild skin irritation in some cases. At first the skin will turn red and become itchy: then once the skin is exposed to sunlight or UV rays the sap will cause deep blisters. Giant Hogweed has been confirmed in British Columbia, Ontario, Quebec, New Brunswick, Nova Scotia, Newfoundland and Labrador. Giant hogweed is also much larger than cow parsnip - it can grow to be several metres tall. A mature plant has huge leaves, between 1–1.5 m (3 ft 3 in–4 ft 11 in) wide, and a stout, bright green stem with extensive dark reddish-purple splotches and prominent coarse white hairs, especially at the base of the leafstalk. Even a tiny amount of the sap in the eyes can cause temporary to permanent blindness. We have been receiving many reports of giant hogweed in the area. These systemic herbicides will be absorbed by the leaves and will move into the root to prevent regrowth the following year. Wild parsnip is the only one with a yellow flower, however cow parsnip is equally noxious when it comes into contact with the skin and giant hogweed is considerably worse. This plant is now restricted in all provinces across Canada. The leaves and flowers are very similar to that of cow parsley and the identification of Giant Hogweed is often confused for it. Giant hogweed typically grows to heights of 2 to 5 m (6 ft 7 in to 16 ft 5 in). Hollow, ridged stems vary from 3–8 cm (1–3 in) in diameter, occasionally up to 10 cm (4 in) in diameter and ca… To date, all reports have been identified as cow parsnip (Heracleum maximum), a common native plant species. It is an invasive, alien plant that originates from the Caucasus Mountains in west central Asia where it grows in subalpine meadows and forest edges. Seed bank and dispersal After falling from the parent plant, the seeds accumulate and mature in the soil. Nature Conservancy of Canada is urging people to be on the lookout for giant hogweed. 02. To summarize, field researchers need to know what the Giant Hogweed plant looks like and take measures to not come into contact with this plant. Giant Hogweed is suspected in the Yukon. Giant hogweed can be a health hazard to humans and animals What does giant hogweed look like? What is giant hogweed? Stems have prominent purple blister-like pustules on the stems. The City is actively monitoring for giant hogweed. Giant hogweed is a member of the parsley or carrot family and was first introduced to North America as a garden ornamental. Giant hogweed (Heracleum mantegazzianum) is an umbellifer (member of the cow-parsley family), and its flowering stems are typically 2-3 m in height bearing flower heads up to 80cm across. In Alberta, as with many other provinces, Giant Hogweed is being confused with its smaller and less toxic cousin – Cow Parsnip. 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