What is wrong with my watermelon? Can I still eat? Is it out of date?
Discover hollow hearts… A mindblowing real nature phenomenon!
This strange and weird natural phenomenon also known as watermelon “starring”, is created by lack of viable pollen and bad weather conditions during pollination.
In other words, if, during fruit set, so approximately end of April, you have cold cloudy weather, no bees working or any adverse environmental conditions, the developed fruit can display starring.
But as bizarre as they look, the flesh is still edible.
For sources look at the picture descriptions and here for the science behind this strange phenomenon.