Halawa Xeriscape Garden, 527-6113: Introduction to xeriscaping, 9 a.m. to noon May 31. Mark Takemoto will discuss the seven principles of xeriscaping and how to correctly start a water conserving garden. Registration required.

Free admission to the garden of dry-land plants at Halawa Industrial Park is offered 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.

Orchid Society of Manoa, 537-3071: Walter Hiraishi speaks on warm growing miltonias, 7:30 p.m. Wednesday, Manoa Valley District Park.

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

Plant, harvest and taste a variety of dryland taro, 9:30 a.m. June 7.

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