june 7 - june 20 produce quick tips watermelons was picked before it ripened room temperature sliced watermelon can be stored in an airtight container in the refrigerator for 3-5 days you can also freeze watermelon and juice later for smoothies an excellent source of hydration for hot summer days watermelon contains even higher amounts of the antioxidant lycopene that is also concentrated in tomatoes lycopene antioxidants have been shown to in studies facilitate healthy blood pressure regulation seedless watermelons result from specific hybridization techniques and are not genetically watermelons originated from africa and have been in cultivation more than 5,000 years watermelon smoothie sliced watermelon watermelon salad