The largest seed in the world is that of the giant fan palm, Locoicea maldivica, commonly known as the double coconut or coco de mer. It can weigh up to 44 lbs and may take 10 years to develop. It originates from the islands of Praslin and Curieuse in the Seychelles Islands.

According to Bluepeace, "a single seed may be 12 inches long, nearly three feet in circumference".