This is a huge juicy watermelon. The watermelon fruit is berry-like and has a smooth skin - green or yellow, and a juicy, sweet, usually red interior. Watermelon is believed to have originated in South Africa, where the species has the greatest diversity. The root system of the watermelon reaches up to 2 m deep and 3 m in diameter. The stem is prostrate, with several skeletal branches that are pubescent. Watermelon was cultivated early on because of its high water content. It was stored to be eaten in dry seasons as a source of water and food. The first watermelons were not sweet, but bitter, with a yellow-white interior. They were also very difficult to open. The current watermelon, which is sweet and easy to open, has been cultivated over time through selective breeding.