Knickerbocker Press, New York, 1997. Authors: Clive Innes & Charles Glass.. Over 1200 varieties all illustrated in full color. An ideal practical identification handbook and working reference resource for amateur and professional enthusiasts everywhere. All the information needed to identify individual plants and then to select varieties that will look and grow best in specific climates and locations. Many of the new inter-genetic hybrids which are currently arousing tremendous interest among fans, are represented. Additionally contains items such as soil types, sun or shade, maintenance and pests.