Toronto-based Richard Dickinson has taught plant taxonomy for more than 25 years, and here he talks about every gardener’s favorite—or is it unfavorite?—subject, weeds. Learn how they get so good at being weedy, and what their environmental impact is beyond taking space away from desired plants (spreading plant diseases, or harming monarch butterflies, for example). Plus a 101 on how gardeners can learn to “key out” one plant from another, using simple clues like a taxonomist does.
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