“AOS Guide to Orchids and their Culture” is an American Orchid Society publication written by Mary E. Gerritsen and Ron Parsons. This 245-page book, beautifully illustrated with over 450 color photographs, covers a myriad of topics on orchid culture. Topics include specific information on popular orchid groups, repotting, orchid mounting, growing orchids semi-hydroponically, as well as a section on common orchid pests and diseases.