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
Koa Kannon one urn was secretly collected up by a group including Miyoshi Tobita, the manager of Kuboyama Crematorium, and Shohei Sanmonji, defense counsel to Kuniaki Koiso, and on 3 May 1949 this urn was carried to the Koa Kannon temple due to its links with Matsui. Right away the head priest Master Ninrei Itami intuitively understood that these were the ashes of the seven war criminals and hid them until he thought the time was right. Finally on 19 April 1959 the stone monument of the seven warriors was erected, with the inscription written personally by former prime minister Shigeru Yoshida,