Halawa Xeriscape Garden, 527-6113: Free admission to garden of dry-land plants at Halawa Industrial Park 10 a.m. to 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 to 11:30 a.m. every fourth Saturday of the month. Bring walking shoes, insect repellent, rain gear and work gloves.

Lyon Arboretum, 3860 Manoa Road, Honolulu, 988-7378: Jerry Shelmidine will show how to grow culinary herbs in backyards and containers, 9:30 to 11:45 a.m. tomorrow, downstairs classroom. Limited enrollment. Cost: $17.50.

Urban Garden Center, 453-6050: Gardening series classes 9:30 to 11:30 a.m. Wednesdays, 962 Second St. Topics include: air layering and grafting, April 2; dendrobium orchids (Honohono), April 9; cucumber, April 16; plants for lei making, April 23; and sweet and hot peppers, April 30. Costs $5. Call for a registration form.

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

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TELEVISION

Focus on Agriculture class: On-air one-credit course for students and the general community will feature Dr. Charles Laughlin, dean of the UH-Manoa College of Tropical Agriculture and Human Resources.

Sessions air 7 to 8 p.m. every Thursday, on Channel 4 in East Hawaii; Channel 13 in West Hawaii and Central Maui; Channel 50 in West Maui; Channel 55 in Central Oahu; Channel 21 in Hawaii Kai; and Channel 10 on Kauai.

The class will focus on statewide programs in high schools and colleges.

For more information call Dr. Jack Fujii at 974-7393 in Hilo.