CRATER OVERNIGHTER — The Friends of Haleakala National Park service trip Dec. 15-17 will plant native grasses, shrubs and trees. Accommodations at Kapalaoa Cabin. Call Farley Jacob at 808-248-7660.

LANIPO TRAIL CLEARING — The Sierra Club and O'ahu Invasive Species Committee will be clearing Himalayan blackberry from Lanipo Trail on Dec. 8. Meet at 8 a.m. at Church of the Crossroads; bring hiking boots, long pants, rain jacket, water, lunch, hat, sunscreen. RSVP to 286-4616 or oisc@hawaii.edu.

WORM COMPOSTING — Learn the basics of vermicomposting at 1 p.m. today at Manoa Gardens Elderly Housing Community Center, 2790 Kahaloa Drive; $30 fee includes minibin, starter colony and manual. To register, call 382-0432 or e-mail waikikiworm@hawaii.rr.com.

BIRD BANDERS — Volunteers are needed to assist in bird banding and data collection to investigate malaria in O'ahu birds. Must be able to hike moderate distances and carry equipment. Contact Kira Krend at krend@hawaii.edu.

KA'ALA FARM SERVICE TRIP — Help the Board of Water Supply restore a native forest in Makaha by cutting down alien trees on Dec. 1. Meet at Church of the Crossroads at 7:30 a.m. or at entrance to the Wai'anae Boat Harbor at 8:15 a.m. Be prepared for 30-minute hike to site; call Randy Ching at 942-0145.

SANDY BEACH CLEANUP — Join the Sierra Club 8:30-10:30 a.m. Dec. 2 for one-mile highway and coastal cleanup. Bring closed-toe shoes, water, hat and sunscreen; bags, gloves provided. Signed waiver needed for children. Meet at Sandy Beach Park's east restroom. Call 394-2898.

POUHALA MARSH RESTORATION — The Hawai'i Nature Center is restoring Pouhala Marsh in Waipahu. Volunteers are needed to pull pickleweed and mangrove 8:30-11:30 a.m. Dec. 15. Bring work gloves, water, hat, sunscreen, towel and change of clothes; covered footwear and long pants required. Contact Pauline Kawamata at 955-0100, ext. 18.

KANE'OHE WETLAND PROJECT — Volunteers needed Dec. 8 to help the Sierra Club remove mangrove and other invasive species from wetlands on Marine Corps Base Hawai'i to create habitat for endangered waterbirds. Submit name and contact information by Dec. 6 to Annette Kaohelaulii at 235-5431.