Shriveled Watermelons

Question

My watermelons are shriveled up on the end. They were growing great, then all at once they quit growing and shriveled up on one end. What is causing that?

Answer 1

This is blossom end rot. This article is about squash blossom end rot, but melons and squash are similar so it will help:
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm