1. Look at the melon rind: melons with floral rinds should have clear lines and distinct shades. Watermelons with neat lines are good melons. It is best to choose a green color, not foggy and white. For melons with black skin, the skin should be dark and shiny. Generally, the vertical stripes of watermelon should be widely spaced and the horizontal stripes should be dense, indicating that the watermelon is growing well and mature enough.

2. Look at the melon vine: If the melon vine is a straight line, don’t use it, but if it is curled and circled, it will be very sweet. The vine part of the melon is concave inward, the vine handle is close to the skin of the melon downward, and the part near the pedicle is thick and green, which is a sign of maturity. The main vine of the melon vine is called the mother vine, the branches are called the daughter vines, and the further branches are called the grand vines. The melon vines formed by the mother vine are curved, and the daughter vines or grand vines are straighter because the mother vine has the most sufficient supply of nutrients. So it is the sweetest and most delicious.

3. Look at the melon navel: the smaller the melon navel, the better. On the contrary, the larger the melon navel, the thicker the skin and the more unpalatable it is. The melon navel is narrow and tight, indicating good fertilization management and fruit development, with better sweetness and taste. Choose melons with a flat umbilicus. A sunken melon umbilicus may be the result of fruiting in cold weather. The melon rind is thick and hard, and there is less edible flesh. The more sunken the melon, the less meat. The larger the fruit shape, the more obvious the sunken melon umbilicus. You can use your fingers to press near the navel. If it is elastic, it means it is mature. If it is hard, it means it is not yet ripe or the melon skin is too thick and the melon has less flesh.

4. Touch the skin of the melon: Use your fingers to touch the skin of the melon. If the skin feels smooth and hard, it is a good melon. If the skin of the melon is sticky or soft, it is a bad melon. If you touch the green markings on the skin of the watermelon, and if you touch it vertically and there is a sunken feeling, it means it is fully ripe. If the melon is emerald green, you can enjoy it immediately. However, if the melon is dry or has no stem, it means it is overripe.

5. Listen to the sound: The sound when the food is cooked just right is like slapping a belly, and the sound is low. If the sound is like patting the head, it means it is not cooked enough. Hold the tail of the melon with one hand, and tap the waist of the watermelon horizontally with the other hand. If it sounds dull and vibrating, it means it is mature and has sufficient moisture. There was a crisp sound of "dong, dong", and Togua's hand felt a little trembling. It was a ripe melon. The one that makes the "burst, burst" sound is relatively mature. If it makes a "pop, pop" sound, it is an overripe melon. The thing that makes the "ta, ta" sound is the raw melon.