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
Return to Field Guide to Noxious and Other Selected Weeds of BC


 

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