It was doing great, then all of sudden the end of the watermelon turned brown-not the stem end. Why? Too much water or not enough? I live in Tn. and we have not had much rain, but I watered every day. I have a rain barrel.
First Time Growing Watermelon
Certified GKH Gardening Expert
This is blossom end rot and is normally cause by too little or uneven watering. This article about squash end rot applies to melons too and will help: