Pomelosare considered citrus fruits, and are closely related to grapefruits and the other members of the Citrus genus. Its scientific name ofCitrus maximabecause it is the largest citrus fruit. The closest in size to this king of citrus fruits is a grapefruit. Pomelos are primarily found in Southeast Asia, which is their native region, and primarily found there. It has not become widely popular in other parts of the world, because it typically takes 8 years before the seeds can begin to flower and bear fruit. Also, much of the weight and volume of pomelos is tough and inedible, while only the inner flesh is palatable.