The world's first grafted Acaciakoa, growing on an Acacia mangium rootstock in Hilo Hawaii. The tree is about 4.5 years old and was grafted at the seedling stage just below the cotyledons. Grafting is an important management strategy for soilborne diseases. For more information about the grafting method, see Nelson, S. C., 2006. Grafting of Acacia koa Gray onto young seedlings. Native Plants Journal 7 (2):137-140. Photograph: Scot C. Nelson (August 2009).