Cactus and Succulent Society of Hawaii: Annual moonlight walk begins with potluck dinner, 6 p.m. July 19, Koko Crater Botanical Garden. Free. Bring a flashlight. Information, 522-7063.

Friends of Halawa Xeriscape Garden, 99-1268 Iwaena St., 527-6113: "Native Plant Propagation" class with Mary Wickenden, 10-11:30 a.m. tomorrow. 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..

Hilo Orchid Society, 1-808-334-1405: 9 a.m.-5 p.m. Thursday through July 19, and 9 a.m.-2 p.m. July 20. Admission: $1.50.

Ho'omaluhia Botanical Garden, 233-7323: Flower exhibition, 9 a.m.-4 p.m. tomorrow and Sunday. Floral arrangement demonstrations, 10-11:30 a.m. tomorrow and 1:30-3 p.m. both days. Children's classes, 12:30-1:15 p.m. Reservations required for children's class. Free.

Learn about rain forest plants 10 a.m. Saturdays and 1 p.m. Sundays. Free.

Japanese Cultural Center of Hawaii, 2454 S. Beretania St., 945-7633: Ikebana demonstration and lecture, 7 p.m. July 14, Weinberg Building, Room 102. Free.

Urban Garden Center, 453-6050: Gardening classes 9:30-11:30 a.m. Wednesdays, 962 Second St. Topics include: sweet potato, July 16. Costs $5. Call for registration form.

Wahiawa Botanical Garden, 621-7321: Hands-on gardening, 9-11 a.m. Wednesdays. Free.