Halawa Xeriscape Garden, 527-6113: Free admission to garden of dryland 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.
Hawaii Orchid Growers Association: Joining with the Honolulu Orchid Society, the groups will hold the society's 58th Annual Show and Sale, "A Symphony of Orchids," Oct. 16-20, Blaisdell.
On Oct. 18, the association will hold their conference featuring a panel discussion with some of Hawaii's top orchid producers plus six speakers. Cost of the conference, including lunch, is $75 before Aug. 31, $100 from Aug. 31-Sept. 15, and $125 thereafter. Room/car packages are available and the association will also give guided orchid nursery tours on Oahu and the Big Island.
For information, call Cassandra Phillips at 1-808-968-8825.
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.
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: Dean Okimoto leads a tour of Nalo Herb Farm, 9:30-11:45 a.m. tomorrow. Meet at 41-574 Makakalo St., Waimanalo. Cost: $15.50.
Frank Sekiya gives a tour of Frankie's Nursery, 9:30-11:45 a.m. Wednesday. 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. Wednesday, downstairs classroom. Cost: $15.50 plus $2 supply fee.
Registration required for all events since class size is limited.
Pacific Culture Center, 1835 Vancouver Drive: Mokichi Okada Association Health and Cultural Fair, 10 a.m.-1 p.m. Sunday. Highlights include: Creating a miniature flower arrangement using recycled materials; methods of nature farming; natural and organic food samples; and cooking demonstrations.
Wahiawa Botanical Garden, 621-7321: Hands-on gardening, 9-11 a.m. Wednesdays. Free.
Waimea Arboretum Foundation: Waimea Valley's 18th Annual Plant and Craft Sale, 9 a.m.-3 p.m. Sunday, on the lawn area at the entrance to Waimea Valley and Adventure Park. Information, 638-8511.