A grove of koa trees is pictured on Haleakala Ranch land. Since 2015, the ranch has been planting native koa trees in an effort to “shade out” gorse, an invasive thorny shrub that grows in ...

Haraguchi and other US Forest Service scientists found the stem diameter of koa trees with timber potential doubled through a combination of treatments that included thinning, herbicides and ...

I never imagined one existed. Koa, which means “brave” or “warrior” in the Hawaiian language, is the largest of Hawaii’s endemic forest trees, not found anywhere else in the world.