A horticultural core curriculum and draft copies of three horticultural cluster curricula are provided. Materials related to the curriculum development project appear first. The core curriculum is designed to provide broad initial instruction in horticulture for students in the first year of a secondary-level vocational horticulture program. The format for each of the 11 units is as follows: purpose, time requirement, specific objectives, unit outline, suggested activities that are cross-referenced to major sections of the unit outline, evaluation (including suggested method--written and/or performance), and list of references. Units cover career orientation, Future Farmers of America in horticulture, soils, general knowledge of plants, general safety procedures, horticulture hand tools, basic horticultural practices, small engine power in horticulture, identification and control of plant problems, safe application of horticultural chemicals, and horticultural business management. The cluster curricula are: (1) arboriculture; nursery operation and management; turf; and landscape design, establishment, and maintenance; (2) floriculture--floristry and greenhouse operation and management; and (3) olericulture, tree fruits, and small fruits (YLB).