Foster Botanical Gardens, 522-7060: Plant sale, 9 a.m.-3 p.m. Sept. 13. Free admission.
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 are free on Thursdays and the last Saturday of each month; call 527-6113 for an appointment.
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. fourth Saturday of the month. Bring walking shoes, insect repellent, rain gear and work gloves.
Kahala HydroGreenery, 735-8665: Hydroponic gardening class, 9-
10:30 a.m. Saturdays. Free. Reservations, 735-8665.
Lyon Arboretum, 3860 Manoa Road, Honolulu, 988-7378: Frank Sekiya gives a tour of Frankie's Nursery, 9:30-11:45 a.m. Sept. 6. Meet at 41-999 Mahiku Place, Waimanalo. Cost: $15.50.
Introductory class to growing Oriental culinary herbs by Jerry Shelmidine, 9:30-11:45 a.m. Sept. 6, downstairs classroom. Cost: $15.50 plus $2 supply fee.
"Basic Water Gardening" with Betsy Sakata, 9:30-11:45 a.m. Sept. 13, downstairs classroom. Cost: $15.50.
Registration required for all events since class size is limited.
Wahiawa Botanical Garden, 621-7321: Hands-on gardening, 9-11 a.m. Wednesdays. Free.