Friends of Halawa Xeriscape Garden, 99-1268 Iwaena St., 527-6113: "Native Plant Propagation" class with Mary Wickenden, 10-11:30 a.m. July 12. Cost: $2. Registration required.
Halawa Xeriscape Garden, 527-6113: Free admission to garden of dry-land plants at Halawa Industrial Park 10 a.m.-2 p.m. Saturdays and Wednesdays. Guided tours free on Thursdays and the last Saturday of each month; call 527-6113 for an appointment.
Hilo Orchid Society, 1-808-334-1405: 45th annual orchid show, 9 a.m.-5 p.m. July 17-19, and 9 a.m.-2 p.m. July 20. Admission: $1.50.
Ho'omaluhia Botanical Garden, 233-7323: Learn about rain forest plants 10 a.m. Saturdays and 1 p.m. Sundays. Free. Bring walking shoes, bug repellent, rain gear and a picnic.
Compost workshop, 9:30-11:30 a.m. every fourth Saturday of the month. Bring walking shoes, insect repellent, rain gear and work gloves.
Japanese Cultural Center of Hawaii, 2454 S. Beretania St., 945-7633: Ikebana demonstration and lecture with Lillian Koide and Lorraine Tanimura, 7 p.m. July 14, Weinberg Building, Room 102. Free.
Lyon Arboretum, 3860 Manoa Road, Honolulu, 988-7378: Jerry Shelmidine shows how to grow culinary herbs in back yards and containers, 9:30-11:45 a.m. tomorrow, downstairs classroom. Cost: $17.50. Limited enrollment. Call to register.
Urban Garden Center, 453-6050: Gardening series classes 9:30-11:30 a.m. Wednesdays, 962 Second St. Topics include: sweet potato, July 16; eggplant, July 23; and flowering heliconia and ginger, July 30. Costs $5. Call for a registration form.