E is for Echinacea, possibly the most used medicinal herb/flower in the world. Recently the Daily Mail in England did an article on the efficacy of echinacea as a cold remedy.  And the University of Maryland has a lot of information about the medicinal properties of echinacea here But even if you are not interesting in growing echinacea, otherwise known as coneflower , is a wonderful plant for the perennial border. For years I only knew it in…