Field Guide to Noxious and Other Selected Weeds of British Columbia

Giant Hogweed
(a.k.a. Giant Cow Parsnip)
(Heracleum mantegazzianum)

Plants grow to 5 metres tall

  • large, hairy perennial herb in the Parsley Family with stout taproot of fleshy, fibrous roots; hollow green stems with purple spots grows to 5 metres tall; dark green, coarsely toothed leaves divided into 3 large segments; lower leaves can exceed 2.5 metres in length; small white flowers are produced in large flat-top umbrella-like terminal clusters up to 0.8 metres across
  • can produce 50,000 seeds per plant
  • an escaped garden ornamental originating from Caucasus region of Asia
  • Warning: small hairs on stems and leaves contain a poisonous sap that can cause severe irritation, blistering and dermatitis

Deeply divided leaves can grow to over 2.5 metres long

More information on giant hogweed
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