My sister started some foxglove plants last year and shared them with me. I had my doubts, thinking the front garden was a bit too sunny. This spring, stalks shot up from the spirals of leaves. Now the flowers are opening, fancy pink frocks with speckled linings. The unopened top buds curve and nod in the breeze. They are dramatic and glamorous. They are also poisonous, the source of the heart medicine, digitalis: floral femme fatales that can both kill and save lives.