Nothing wrong with that white underbelly thing. That's a watermelon. It
won't rot because it's white or always on the ground, only if something
bores into it or munches on the rind. Even then, I've seen the melon dry out
on the area, almost heal over, with no rot.
Several ways to tell, and I still screw it up. Check the tendril closest to
the melon. When it had dried completely and the adjacent leaf, that is a
good sign. If you had a dry summer however, they will dry up and the melon
may still not be ready to eat.
Look at the under side. If it has turned a yellow or white (depending on
what color the melon is) and the color of the melon has become dull rather
than shiney, that is a good sign.
You can lift the melon from the ground in one hand and slap it with the
other. When you feel the vibration of the slap in the hand used to hold the
melon, that is a good sign.
After all these good signs occur, I would still give it a week. The best
sign is to cut it into and when the melon is red, yellow, or pink (depending
on the kind of melon), and it tastes sweet and delicious, that is a really
good sign. Good luck.
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