SPRING PLANT SALE, offering indoor, desk and outdoor plants including rare and unusual plants, native Hawaiian plants and ferns, hapu'u, terrariums, lotus, air plants, orchids, heliconia, gingers, drought and filter-light plants, ti and anthurium, plus worms, worm bins and vermicast; 9 a.m.-2 p.m. May 29; Foster Botanical Garden; sale and garden tours, free; 537-1708.
SPRING VINTAGE SALE, including mini-herb gardens made from 1930s and '40s enameled pots, tubs and tea kettles (including peppermint, chives, parsley, thyme, sweet marjoram, basil, mint and violets; as well as vintage items, including collectibles, water lilies and plants, clothes made from viintage lace, tablecloths and hankies; garden antiques, jewelry, kitchenware, handbags and more, 5-8:30 p.m. May 28, and 9 a.m.-2 p.m. May 29, Wai'oli Tea Room; free; information, Darren, 226-3526.
"BUILDING YOUR HOME FOR LIFE," one of a series of free seminars on the new home construction process, by homebuilder Graham Builders, covering residential design, budget, financing, scheduling and builder selection, 9-11 a.m. May 22, Honolulu Country Club; free, open to the public; reservations, 593-2808, www.grahambuilders.com.
'AIEA RIDGE HIKE, presented by Friends of Honolulu Botanical Gardens, with opportunity to view different species of 'ōhi'a, lehua, koa, 'iliahi, and other native trees, 8 a.m.-1 p.m. May 22, from top of 'Aiea State Park; $5 ($10, non-FHBG members); information, 537-1708, www.friendsofhonolulubotanicalgardens.com.
"FASCINATING FICUS," hike through Lyon Arboretum, and presentation on "wanton wasps, lurid pollination strategies, ravenous rock-eating trees, and the good ficus and bad ficus," 9:30 a.m.-11:30 a.m. May 22, Lyon Arboretum; $20; registration, 988-0461.
LAUHALA TURTLE-MAKING CLASS, 9:30 a.m.-2 p.m. Wednesdays, through May 26, Foster Botanical Gardens; $10 (plus garden admission); reservations: 522-7064.
SECOND SATURDAY AT THE GARDEN, a series of events offering a chance to stroll the garden and learn about tropical gardening from certified Hawai'i master gardeners and center volunteers; 9 a.m.-noon, second Saturdays monthly; Pearl City Urban Garden Center; free; www.ctahr.hawaii.edu/ougc, 453-6055.
NIAULANI NATURE WALK, guided tour through an old-growth forest; 9:30 a.m. Mondays; Volcano Art Center's Niaulani campus, Volcano Village, Big Island; 808-967-8222, www.volcanoartcenter.org.
TUESDAYS AT KANAHĀ, weekly beach cleanup and plant maintenance, coordinated by Community Pride at Kanahā Beach Park, Maui, 8-10 a.m. Tuesdays, at the park; Valerie Vines Magee, 808-264-1454.
MĀNOA HERITAGE CENTER, discover an old Hawaiian heiau and native plants while learning Mānoa Valley's history; 9 a.m.-4 p.m. Tuesdays-Saturdays; Mānoa Heritage Center; $7 general, $4 seniors and military, students free; visits and tours by reservation only: 988-1287, www.manoaheritagecenter.org.
HO'OMALUHIA PRESCHOOL NATURE HOUR (for ages 3-5) with stories, songs, crafts and nature hikes (optional picnic lunch); 10:30 a.m., third Tuesday monthly; from visitor center; recommended: walking shoes, insect repellent, rain gear; information, 233-7323
WEED & POT CLUB at Maui Nui Botanical Garden, 8:30-10:30 a.m. Wednesdays, 150 Kanaloa Ave., Kahului, Maui, to do beautification and maintenance work; tools, gloves, drinking water provided; wear shoes; 808-249-2798.
BOTANICAL DRAWING AND PAINTING, rendering of plants, flowers, seeds and pods from the garden; 9:30 a.m.-noon Wednesdays, Ho'omaluhia Botanical Garden, Kāne'ohe; recommended: No. 4 round brush, Bristol paper, watercolor set or pencils; free; reservations, 233-7323.
MAKIKI FOREST RESTORATION PROJECT, volunteers needed for Makiki Watershed Awareness Initiative forest restoration, 9 a.m.-2 p.m. fourth Saturday of each month; weed, pick up branches, plant, water and fertilize; wear long pants, long sleeves, shoes or boots, gloves, insect repellent and bring water and lunch; meet at Makiki forestry base yard above new Hawaii Nature Center; 973-9782.
FREE GARDEN MULCH, 9 a.m.-3 p.m. Saturdays, Hālawa Xeriscape Garden, 99-1269 Iwaena St.; www.boardofwatersupply.com, 748-5041.
HO'OMALUHIA FAMILY CATCH AND RELEASE FISHING, 10 a.m.-2 p.m. Saturdays and Sundays, yearlong, Ho'omaluhia Botanical Garden, Kāne'ohe; recommended: walking shoes, insect repellent, rain protection, barbless hooks and fishing gear; free; reservations, 233-7323.
LYON ARBORETUM WORKDAY, weeding and garden maintenance with arboretum grounds crew, first Saturday monthly; information: 988-0456.