5639- Citron. Watermelon family but not your typical watermelon, white solid flesh is inedible raw. This red-seeded variety of citron has been grown for centuries and used to make preserves and "sweetmeats" that are added to fruitcakes, cookies and puddings. The best fruits can be stored for up to a year and these should be the fruits that you save seed from for future planting. Extremely productive. 90-100 days.