Are they really? I read (source: Samuel Thayer) that there is no real evidence that dandelions are non-native, and that many species are considered introduced because some people from the 1700’s thought that a species couldn’t possibly be native to both North America and Eurasia.
Also, are all introduced species invasive? I thought that invasive meant that the species harms other (native) species, often on a large scale. For example, the plantain, or “white man’s footstep”, is non-native to the US and Canada, but does nothing but sit there and be useful.
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