It is called Blossom-end rot and occurs with a lack of calcium (or a deficient amount). Apply 3-4lbs of soft rock phosphate per 100 square feet. Several nurseries in the DFW area carry this product. Also, water deeply, then let it get a little dry between watering. So, water every 3 days or so, but water deeply. Fertilize every2-3 weeks and spray the foliage weekly with liquid seaweed.
_________________ Sandi Texas Certified Nursery Professional Texas Master Naturalist Organic gardener Tree-Hugger Native Texan
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