Crimson Sweet Watermelon Citrullus lanatus ‘Crimson Sweet’ Annual When to Sow: Spring Light conditions: Full sun Ease of Germination: Easy Crimson watermelons are very popular. These melons can grow up to 10kg (25lb). It has a nice crisp and firm flesh with the old fashioned sweet and juicy watermelon flavour. Crimson watermelons are great for…