Plant Odyssey

Gardening expert Carol Klein discovers the intricate biology of the iris flower and its cultural significance to mankind over thousands of years. Then, she heads to the place that comes to everyone's mind when thinking of tulips: Holland.

Gardening expert Carol Klein examines a plant of unlikely economic importance, spiritual significance and artistic inspiration: the waterlily. Then, Carol looks at the rose -- a flower embedded in our history, our fairy tales and our hearts.