Halawa Xeriscape Garden, 527-6113: Free admission 10 a.m.-2 p.m. Saturdays, Wednesdays. Free guided tours Thursdays, last Saturday of month; call for appointment.

Ho'omaluhia Botanical Garden, 233-7323: Learn about rain forest plants 10 a.m. Saturdays and 1 p.m. Sundays. Free.

Compost workshop, 9:30-11:30 a.m. fourth Saturday of the month.

Lyon Arboretum, 3860 Manoa Road, Honolulu, 988-7378: "Getting to Know Good Bugs, Bad Bugs, Slugs and Critters," 9:30-11:45 a.m. June 21. Cost: $15.50. Call to register.

"Colorful Fragrant World of Gingers," 9:30-11:45 a.m. June 27. Cost: $15.50 Call to register.

Urban Garden Center, 453-6050: Gardening classes 9:30-11:30 a.m. Wednesdays, 962 Second St. Costs $5. Call for a registration form.

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