All events are free unless otherwise indicated.

BIODYNAMIC/INTUITIVE GARDENING WORKSHOP SERIES, on interacting more fully with plants and nature (including using homeopathic sprays), 7:30-9 p.m. ,April 7 and 14, Kahumana Community Center and Farm, Wai'anae; free (also dinner, 6-6:30 p.m., $12); directions /reservations, 696-2655.

"CONFLICT, COLLISION AND CONFRONTATION: Sea Turtle Biology and Incompatibility with Marine Debris," one of a series of "Plastic and Hawai'i's Marine Life" lectures and films, organized by the Beach Environmental Awareness Campaign Hawai'i; 6:30 p.m., April 8, University of Hawai'i-Manoa, Art Building auditorium; 393-2168, www.b-e-a-c-h.org.

"RESTORING WAIKIKI'S COASTAL ECOSYSTEM," one of a series of April lectures, sponsored by the UH Sea Grant, Hanauma Bay Education Program, exploring Hawai'i environmental stewardship programs; 6:30 p.m. April 9; Hanauma Bay Education Center theater; free (free parking after 5:30 p.m.); 397-5840.

LYON ARBORETUM SPRING PLANT SALE, with tropical plants from the arboretum and more than 20 nurseries — including dwarf mangoes/exotic fruit trees, roses, orchids, bromeliads, gingers and heliconias, water plants, hibiscus; jams and jellies, handicrafts, lei, educational displays and keiki activities; 9 a.m.-2 p.m. April 11, Blaisdell Center Exhibition Hall; $2; proceeds to benefit the arboretum; 988-0456, www.hawaii.edu/lyonarboretum/.

MACROBIOTIC LECTURE/ COOKING CLASS with Kathy Maddux, with ways to improve liver function; 9 a.m.-noon April 11, The Green House, 224 Pakohana St., Pauoa Valley; $35; registration, 524-8427, http://www.thegreenhousehawaii.com.

"LIVING IN HARMONY WITH NATURE," a permaculture design workshop with garden designer Hunter Heaivilin teaching sustainable gardening practices for the urban environment; 10 a.m.-noon, April 11, The Green House, 224 Pakohana St.; $15; registration, 524-8427, http://www.thegreenhousehawaii.com.