The flower of the Canada thistle (Cirsium arvense) might be somewhat pretty, but that is the only good thing to say about it here in Western New York. Photo courtesy Joel Price, Oregon Department of Agriculture, Bugwood.org by Connie Oswald Stofko There are two kinds of thistles you might have in your garden now: the Canada thistle and the bull thistle. Both have these harmful traits: They have nasty spines. They can reach about five feet tall. They’re invasive species…
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