Thistles where they may

I confess I’ve pulled many thistles out of ignorance and haste, but it’s hard to know whether to pull it or leave it. Bull thistle, milk thistle, Canada thistle, Scot’s and Italian thistles are bad ones. But Indian thistle, edible thistle, few-leaved and wavy-leaved thistles are good ones. It’s probably good that I’ve been lazy and have let some of them grow where they may.