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
Hale Koa Hotel hotel opened on October 25, 1975, with a traditional Hawaiian ceremony. A major expansion came in 1991. The hotel added a new pool, a beverage bar, and a luau garden. Later, the Maile tower was built across the lobby from the Ilima tower, bringing the total number of rooms to 818. Also constructed was an adults-only pool, a fitness center, a parking garage, and Bibas, a new café located on a porch underneath the Maile tower. There are several dining facilities on the hotel's beachfront property: Because Hale Koa Hotel is an AFRC resort, it is not open to the