MALAMA KA'ALA — Spend the day on Ka'ala summit with Army Natural Resource Program on clidemia weed control from 8 a.m.-4 p.m. Friday. Short hike through dense forest required; gloves provided. Interpretive boardwalk hike to follow. Space limited; adults only. Contact Kim Welch or Candace Russo at 656-7641 or e-mail kmwelch@hawaii.edu.

NA POHAKU PROJECT — Work in a native plant garden off Kapa'a Quarry Road in Kailua on Saturday. Bring work gloves, water. Call for meeting time, place; Randy Ching, 942-0145; Ed Mersino, 223-5765.

CHUN'S REEF CLEANUP — Join Adopt-A-Beach Hawaii and Save The Sea Turtles International at noon Saturday for Chun's Reef Beach highway and coastal cleanup. Trash bag, gloves and purified water provided; bring hat, sunscreen and beach shoes. Meet at 61-529 Kamehameha Highway, Hale'iwa. See www.seaturtlesinternational.com or call 637-2211.

CRATER OVERNIGHTER — Stay over at Holua Cabin on a Friends of Haleakala National Park service trip to weed heterothica Oct. 20-22. Call 808-248-7660.

MAKE A DIFFERENCE DAY — Surfrider Foundation and Sierra Club are co-hosting a beach cleanup at Ala Moana Park from 9 a.m.-12:30 pm. Oct. 27. Meet near entrance to Magic Island. Gloves, garbage bags, refreshments and post-cleanup barbecue provided. Deadline to register is Saturday; call Arlene Buchholz, 988-9806.

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. Oct. 27. Bring work gloves, water, hat, sunscreen, towel and change of clothes; covered footwear and long pants required. Call Pauline Kawamata, 955-0100, ext. 18.

LIMAHULI HELPERS — Kaua'i's Limahuli Garden & Preserve of the National Tropical Botanical Garden seeks volunteers to restore native forest Thursdays, 8-11 a.m. Call Lahela Correa, 808-826-1053, or Lea Taddonio, 808-332-7324, ext. 228.

Send listings to: For the Environment, P.O. Box 156, Wailuku, HI 96793; cwilson@honoluluadvertiser.com; or fax 808-242-1520.