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Submit a photoGiant Hogweed
Heracleum mantegazzianum
⚠️ PROHIBITED NOXIOUS — must be destroyed under Alberta's Weed Control Act. A massive biennial/short-lived perennial from the Caucasus region reaching 3–5 m tall, with enormous umbrella-like white flower heads up to 50 cm across. Extremely dangerous: clear sap contains furanocoumarins that, when combined with sunlight, cause severe blistering burns and long-lasting dark scarring. Do not handle without full protective clothing — report sightings to your municipal Agricultural Fieldman.
Quick Facts
Distribution
Introduced, scattered in Alberta; report all sightings
Light
Full sun to part shade
Bloom Time
June–July (2nd year)
Soil
Rich moist soils, streambanks, disturbed ground
Water
High
Growing & Cultivation
Propagation
DO NOT PROPAGATE. Control: report to municipality and let trained crews remove. If you must handle, wear Tyvek suit, goggles, and gloves; cover all skin; work only on overcast days.
Always verify plant identification with multiple sources before consuming any wild plant. This information is for educational purposes only.
