Mine grow and then get this black spot on the end of them before rotting. What can I do to stop this?
Black Ends and Then Rotting
Certified GKH Gardening Expert
We are not sure what kind of plant you are talking about, but the problem is called blossom end rot. Here are a couple articles on how to fix it in both tomatoes and squash:
If your problem plant is a melon, then the advice in the squash article will help.