Watermelons can grow to a variety of sizes. The 1998 edition of the Guinness Book of World Records says that the largest grown weighed 262 pounds (119 kilograms). An interesting thing about a watermelon is that it can be a male or female watermelon. The gender of the fruit can be found by taking a look at the bottom side of the watermelon and looking at the ring that is in the opposite direction of the other circles. A male watermelon will have a small penny-sized ring while a female watermelon will have a larger quarter-sized ring. This is important since females are sweeter and with less seeds.