Friends of Halawa Xeriscape Garden, 99-1268 Iwaena St., 527-6113: "How To Xeriscape" class with Mark Takemoto, 9 a.m.-noon tomorrow. Cost: $2. Preregister.

Halawa Xeriscape Garden, 527-6113: Annual open house and unthirsty plant sale, 9 a.m.-3 p.m. Aug. 2, 99-1268 Iwaena St.

Free admission to garden 10 a.m.-2 p.m. Saturdays and Wednesdays. Free guided tours Thursdays and last Saturday of each month; by 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: Luis Manrique shows how to produce taro at home, 9:30-11:45 a.m. tomorrow. Cost: $15.50. Call 988-7378.

Janet Thebaud Gillmar teaches how to grow herbs, vegetables and fruits in a harmonious, interesting arrangement, 9:30-11:45 a.m. Aug. 2. Cost: $15.50. Call 988-7378.

"Growing French-Style Vegetables in Hawaii" with Janice Ito, 12:30-2:30 p.m. Aug. 2. Cost: $15.50. Call 988-7378.

Visit Douglas De Moss Orchids, 9:30-11:45 a.m. Aug. 2, Cost: $15.50. Call 988-7378 or 595-2660.

University of Hawaii-Manoa, Art Auditorium, 956-9883: French Medieval Garden Series by Francoise Winieska includes "The Rose Throughout the Ages and the French Medieval Garden," 7 p.m. July 31; "Vegetable Gardens," 4 p.m. Aug. 3; "Versailles," 7 p.m. Aug. 7; "A Stroll Through Paris," noon Aug. 8 (bring a brown bag lunch); and "Monet's Giverny," 4 p.m Aug. 10.

Urban Garden Center, 453-6050: Gardening class on flowering heliconia and ginger, 9:30-11:30 a.m.Wednesday, 962 Second St. Costs $5. Call for registration form.

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