Noxious or Nice?

  The swiftest way to find yourself in a rollicking argument with someone you may otherwise count as a friend, is to disagree with them over whether a plant is useful in the garden, or is a noxious, invasive weed.  This drama can erupt among those of us passionate about our gardens and the plants we grow.  We all know just enough to know we’re right, but these arguments over plants can hinge on nuance and circumstance. Do you know...