The world’s largest seed, the coco de mer, is legendary among plants. It can weigh over 50 pounds and measure up to three feet in circumference. Before it was discovered that it grew on palms native to the Seychelles, seamen who caught a glimpse of one drifting in the Indian Ocean thought it came from mythical underwater trees. That’s how it got its name, meaning “coconut of the sea.”The world’s largest seed, the coco de mer, is legendary among plants. It can weigh over 50 pounds and measure up to three feet in circumference. Before it was discovered that it grew on palms native to the Seychelles, seamen who caught a glimpse of one drifting in the Indian Ocean thought it came from mythical underwater trees. That’s how it got its name, meaning “coconut of the sea.”