No matter what size you are angling for, pick the heaviest in that size range. Heavy means the fruit is bursting with water.
Melons with plenty of pink, juicy flesh will sound hollow when you tap on them. Fruit that sounds solid, dull, or tinny when tapped likely has a thick inedible rind and probably isn't ripe.
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Melons have a spot where the fruit was on the ground. This is known as a “field spot.” In ripe fruits, the spot will be creamy and yellow. In unripe fruits, it will be white or pale.
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Melons that received consistent watering will be juicier than those that did not. You can spot well-watered melons by their smooth, uniform shape (circular or oblong) and a lack of humps.
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Dull watermelons are riper than shiny ones. Look for melons with scars on the side with the yellow spot. These are caused by sugar leaching from the fruit and indicate a sweeter melon.
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