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A Guide to Determining Wood Properties of Acacia koa

Summary The primary attribute of Acacia koa is the quality of its wood as determined by color, figure, density, strength, shrinkage, durability, and workability. This report summarizes the wood properties of koa and presents a sampling strategy for collecting wood samples in populations of koa. Based on whole tree sampling state-wide, there was a wide range of variability in wood color and figure. Branch sampling, a less destructive technique, can also be employed as a determenant of wood quality. Formation of heartwood was found to occur in koa at Keauhou between 10-15 years. This suggests that commercial thinning regimes may begin after age 15 and pre-commercial thinning may begin before age 10 depending on seed source, site conditions, and management objectives. Selecting outstanding trees within a population for color and figure in addition to form and growth performance has the potential to significantly add value to stands of koa.