In 1882 a handful of macadamia seeds were taken from trees in Gympie to Hawaii, where they became the basis of Hawaii's macadamia industry. In 2019, researchers collected samples from hundreds of macadamia trees in Queensland, and compared their genetic profiles to samples from Hawaiian orchards. They determined that essentially all the Hawaiian trees must have descended from a small population of Australian trees from Gympie, possibly just a single tree. This lack of genetic diversity in the commercial crop puts it at risk of succumbing to pathogens (as has happened in the past to banana cultivars). Growers may seek to diversify the cultivated population, by hybridizing with wild specimens.