This compilation is an introduction to classic scientific papers in horticulture, originally published in 1989. Each paper chosen concerns some plant or phenomenon and has had an impact on the horticultural scientific tradition or the horticulture industry. Each paper is accompanied by an introductory essay contributed by a prominent horticulturist. These essays place the historic papers in their contemporary setting as well as describe their impact on the future course of horticulture. Each paper has a unique story to tell and many still engender controversy and passion today. Taken together, they underscore the richness and diversity of horticultural science. Part I Propagation and Tissue Culture. Part II Physiology and Culture. Part III Breeding and Genetics.