Orchids Orchid culture 105 Identification 27 Varieties 24 Dendrobium 20 Pictorial works 19 Congresses 16 more ... Propagation 14 Botany 13 Cut flowers 12 Classification 11 Periodicals 10 In vitro 9 Orchids culture 9 Plants, Ornamental 8 Diseases and pests 7 Phalaenopsis 7 Orchid industry 6 Breeding 5 Marketing 5 Nomenclature 5 Plant diversity 5 Floriculture 4 Flower gardening 4 Flowers 4 Growth 4 Odor 4 Conservation 3 Encyclopedias 3 Fertilizers 3 less ...