Halawa Xeriscape Garden, 527-6113: Introduction to xeriscaping, 9 a.m. to noon April 26. Mark Takemoto will discuss the seven principles of xeriscaping and how to correctly start a water-conserving garden. Registration required.
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.
Hawaiian Botanical Society, 3190 Maile Way, 956-3925: David Hopper will speak on "Pollination of Hawaiian Plants by Hawaiian Bees," 7:30 p.m. May 5, University of Hawaii-Manoa, 3190 Maile Way, St. John Hall, Room 011. Hopper is from the U.S. Fish and Wildlife Service.
Ho'omaluhia Botanical Garden, 233-7323: Volunteer training program for people interested in becoming nature tour leaders, 9:30 to 11:30 a.m. Saturdays, through May 17. Participants should attend all seven classes.
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: Learn to raise anthuriums from Richard Okubo, 9:30 to 11:45 a.m. April 26, downstairs classroom. Limited enrollment. Cost: $15.50.
Urban Garden Center, 453-6050: Gardening series classes 9:30 to 11:30 a.m. Wednesdays, 962 Second St. Topics include: sweet and hot peppers, April 30; planting a lawn, May 7; gardening in the tropical environment, May 14; anthuriums, May 28; dry taro, June 4; lychee, June 18; mango trees, June 25; sweet potato, July 16; eggplant, July 23; and flowering heliconia and ginger, July 30. Costs $5. Call for a registration form.
Lawn installation demonstration, 9:30 a.m. May 3. There also will be volunteers on hand to answer home gardening questions.
Wahiawa Botanical Garden, 621-7321: Hands-on gardening, 9 to 11 a.m. Wednesdays. Free.