I have grown watermellon a few times over the years, and I either pic them too early, or when they are ready to burst. Any good trick to picking them at the right time? I'm growing a variety called Sangria, I grew them last year too. This year I have only 5 on the vines, so I don't want to feed an unripe, or over ripe one to the chickens. lol. I have heard that if you tap them, when the sound has a lower pitch it's riper. Any suggestions would be helpful.