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
Nin Jiom Pei Pa Koa Nin Jiom Pei Pa Koa King-to Nin Jiom Pei Pa Koa (), commonly known as Nin Jiom Pei Pa Koa or simply pei pa koa (), is a traditional Chinese natural herbal remedy used for the relief of sore throat, coughs, hoarseness and aphonia. It is a throat demulcent and expectorant. In the name of the company, "king-to" means "capital", referring to Peking and "nin jiom" means "in memory of my mother"; hence, it stresses the important virtue of filial piety. "Pei pa koa" means "loquat syrup". The product is marketed under the brand name Cap Ibu dan Anak (Malay