macadamia nuts are always the first nut that people reach for macadamia nuts are among the most expensive and rarest of and kirkland signature" macadamia nuts are second to none king nuts grown successfully in only a handful of countries in the africa and east africa macadamia nuts grow on trees reaching heights of 40 to 50 about seven and a half months by rapid oil accumulation in late december and january and starches to oil mature nuts fall to the ground between march and september