5 Fresh Seeds for Planting. The beautiful macadamia tree is the source of expensive but richly flavored nuts prized for their sweet, soft meat. These trees are warm region plants only, but growing macadamia nuts in southern California and other areas with tropical climates is possible. If you are lucky enough to live in one of these tropical climes, knowing how to grow macadamia trees successfully can provide you with a lifetime supply of these desired nuts. Macadamia nut trees can begin bearing in 6 to 7 years, so it is important to put a little time and effort into the tree’s care for the first phase of its life.