Yep, as @Beth_B said, BER. Here in the alkaline soils of Texas the use of Epsom Salts is mandatory. Without it we would not have much of a crop. ES somehow makes the uptake of calcium easier for the plant to manage. In Utah I don't know if it would apply but it wouldn't hurt anything to use it and see.
We found one tomato on a TREEof a plant that had this problem. I have never seen such a happy, green, massive tomato before, and out of the three fruits one had this problem. The water has been consistent and the other fruits are just fine, growing as normal. I had thought some sort of disease had gotten to it.
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