Broccoli, kale, mustard greens and other members of the cruciferous and mustard family produce edible flowers that taste much like the greens.  Let a few plants winter over to provide you a spring and summer full of health protecting flowers rich in antioxidant bioflavonoids. (More)
Cruciferous plants have isothiocyanates that are hydrolyzed to sulphorephane in the mouth to provide protection from cancer.