When crooked neck squash are green in color instead of yellow, are they harmful if eaten? Also, how do you tell when watermelons are ripe? I have some that sound hollow when thumped, but when we cut them they are not ripe.
Green Crooked Neck Squash
Certified GKH Gardening Expert
You can eat green yellow squash without any harmful effects.
The watermelon should not only sound hollow, but should have a very light, almost white spot on the bottom where it was on the ground. If this is still green like the rest of the melon, it is not yet ripe. This article has further information: https://www.gardeningknowhow.com/edible/fruits/watermelon/pick-a-watermelon.htm