Ho'omaluhia Botanical Garden, 233-7323: Compost workshop, 9:30 to 11 a.m. every fourth Saturday of the month.

Lyon Arboretum, 3860 Manoa Road, Honolulu, 988-7378: Betsy Sakata will teach a class on water gardening, 9:30 to 11:45 a.m. March 22, downstairs classroom. Limited enrollment. Cost: $15.50 nonmembers, $11 members.

Dean Okimoto shows how to grow and use culinary herbs, 9:30 to 11:45 a.m. March 27, Nalo Farms. Limited enrollment. Cost: $8 nonmembers, $7 members.

Jerry Shelmidine will show how to grow culinary herbs in backyards and containers, 9:30 to 11:45 a.m. March 29, downstairs classroom. Limited enrollment. Cost: $17.50 nonmembers, $13 members.

How to grow Honohono orchids with Lloyd Esaki, 9:30 to 11:45 a.m. April 5, downstairs classroom. Limited enrollment. Cost: $15.50 nonmembers, $11 members.

Create an arrangement in a natural container with suggestions from Patty Nottingham and Phyllis Guard, 9:30 to 11:45 a.m. April 11, upstairs classroom. Limited enrollment. Cost: $8 nonmembers, $7 members.

Bob Itoman will teach how to cultivate vanilla, the spice-bearing orchid, 9:30 to 11:45 a.m. April 12, downstairs classroom. Limited enrollment. Cost: $17.50 nonmembers, $13 members.

Learn how to raise fruit trees with Frank Sekiya, 9:30 to 11:45 a.m. April 12, Frankie's Nursery, 41-999 Mahiku Place in Waimanalo. Limited enrollment. Cost: $15.50 nonmembers, $11 members. Call 259-8737.

High nutrition gardening with Janice Ito, 12:30 to 2:30 p.m. April 12, downstairs classroom. Limited enrollment. Cost: $17.50 nonmembers, $13 members.

Doug De Moss discusses how to care for orchids, 9:30 to 11:45 a.m. April 18, downstairs classroom. Limited enrollment. Cost: $8 nonmembers, $7 members.

Mike Uyeno demonstrates how to turn a small tree or shrub into a bonsai, 9 a.m. to noon April 19, downstairs classroom. Limited enrollment. Cost: $15.50 nonmembers, $11 members.

Raising anthuriums with Richard Okubo, 9:30 to 11:45 a.m. April 26, downstairs classroom. Limited enrollment. Cost: $15.50 nonmembers, $11 members.

Orchid Society of Manoa, 537-3071: Video on orchid pests and diseases, 7:30 p.m. March 26 at Manoa Valley District Park, 2721 Kaaipu Ave.

Urban Garden Center, 453-6050: Gardening series classes 9:30 to 11:30 a.m. Wednesdays, 962 Second St. Topics include: cabbage, March 19; 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.