The world of plant propagation is cloaked in mystery. What really is a cultivar, a hybrid, or a straight species plant? How are nursery crops typically grown and new plants introduced to the market? Come to the Cambridge Public Library, 449 Broadway, on Wednesday, May 2 at 7 pm to hear an expert nurseryman’s point of view, how plants are selected and bred for new characteristics, and what it really takes to successfully propagate both native and non-native trees, shrubs, and plants for the consumer market. Author Wayne Mezitt is Chairman of Weston Nurseries, and has over 50 years experience in his family’s business. Free admission.