Stem Scar
The stem scar can provide useful information about the watermelon’s development, although it should not be treated as a guaranteed test of sweetness. A dry, well-developed stem scar is generally consistent with a mature melon, while a fresh-looking green stem may indicate that the fruit was harvested more recently or before it had fully matured.
The size and appearance of the scar can also vary naturally between watermelon varieties, growing conditions, and individual fruits. For that reason, it is better to use the stem area as one clue
