Acacia koa for up to 25 years. Scarification is needed before "A. koa" seeds will germinate. Koa is endemic to the islands of Hawaii, Molokai, Maui, Lānai, Oahu, and Kauai, where it grows at elevations of . It requires of annual rainfall. Acidic to neutral soils (pH of 4-7.4) that are either an Inceptisol derived from volcanic ash or a well-drained histosol are preferred. Its ability to fix nitrogen allows it to grow in very young volcanic soils. Koa and ōhia lehua ("Metrosideros polymorpha") dominate the canopy of mixed mesic forests. It is also common in wet forests. The koa's trunk was
Association Island boy's summer camp on the island for several years until abandoning it after 1967. A non-profit group ran sailing and wind boarding competitions on the island in the 1970s. The US sailing team was based there while preparing for the 1976 Montreal Olympics, which held sailing competitions at Kingston, Ontario, about to the north. The island became a privately owned RV park and resort in 1999. The RV park operates as "Association Island KOA 1000 Islands" with address 15530 Snowshoe Rd. Henderson, NY 13650. It is an independently owned KOA franchise. Kurt Vonnegut based some of the material in his