Watermelons:
Look at the outside of the watermelon.
The first thing to notice is the color. Naturally ripe watermelons are a dull green, without excessive shine. The green should be relatively dark. On the other hand, if the watermelon has a grayish hue or is very light green, it may be less sweet and its flesh may be flavorless.
Look at the yellow part of the .
The yellow part of the watermelon, often found at the base, is a good indicator of ripeness. This is the area that touches the ground during growth. If it’s yellow, it’s a good sign; it means the watermelon has ripened naturally. On the other hand, a watermelon with this white area may still be unripe.
Look at the watermelon’s marbling.
Marbling or streaks on a watermelon can also indicate its quality. with dense, even marbling are typically sweeter and juicier. However, if the marbling is sparse or broken, there’s a good chance the watermelon isn’t ripe enough.
Check the navel of a watermelon.
A watermelon’s navel can also indicate its quality. You’ll notice that some navels are large, others small. It’s recommended to choose with a small navel. The smaller the navel, the thinner the skin, indicating good ripeness. A watermelon with a large navel may have been picked too early or chemically treated.