Horticultural Reviews is an ongoing series presenting state-of-the-art review articles on research in the production of commercial horticultural crops: vegetables, fruits, nuts, and ornamental plants of commercial importance. Articles perform the valuable function of collecting, comparing, and contrasting the primary journal literature in order to form an overview of the topic. This detailed analysis bridges the gap between the specialized researcher and the broader community of horticultural scientists.

Jules Janick is the James Troop Distinguished Professor of Horticulture at Purdue University in West Lafayette, IN, USA.