Answer: Blossom end rot is a symptom of calcium deficiency that arises when soil gets very dry during hot, sunny weathers. Water plants well and add some kind of mulch (shredded straw or grass clippings) to the soil surface to maintain soil moisture. Pick off the affected fruit, and mist the leaves of the plants with a kelp or seaweed based foliar fertilizer (if you can't find it locally, it's available from Gardener's Supply Co. This should give them the nutrients they need quickly to recover and produce healthy fruit. There are also sprays you can use - look in the fertilizer section for calcium sprays effective against blossom end rot. Good luck with your tomatoes!
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