What is this plant, is it a weed, and is it poisonous?

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  • It's leaves are too broad to be the Canadian thistle
    – Johan88
    Jan 30 '19 at 13:44

It looks like a species of wild Ageratum, a genus of plants in the family Asteraceae. It might be Ageratum houstonianum or Ageratum conyzoides which are commonly called "billygoat weed". There are several species in the genus. The Wikipedia link mentions both "weed" and "toxicity" in their article about the genus Ageratum, but some species are grown for their flowers. I hope the following links are helpful.





  • Thanks for the input :) Masterful suggestion.
    – Johan88
    Feb 10 '19 at 17:21
  • Yes, upon closer inspection u r right. Amazing ! According to my government database we have both Ageratum houstonianum Mill., and conyzoides L.. Both non-native invaders. Thanks ! And according to their database A. houstonianum flowers year round ! Fantastic !
    – Johan88
    Feb 13 '19 at 2:17

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