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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 at 13:44
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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.

https://en.wikipedia.org/wiki/Ageratum

http://wallumsmusings.blogspot.com/2012/07/ageratum-blue-billy-goat-weed.html

https://en.wikipedia.org/wiki/Ageratum_conyzoides

https://www.flickr.com/photos/31031835@N08/15596972833

  • Thanks for the input :) Masterful suggestion. – Johan88 Feb 10 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 at 2:17

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