A Calcium Deficiency

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Linda wrote:
What causes my tomatoes to get black on the bottom before they rippen?

Dear Linda:
This is called blossom end rot. It is a calcium deficiency. You will need to add a quick
acting source of calcium. Look for a product called blossom end rot spray which will
be poured or drenched over the plant according to instructions on the label.
My Best,
Stan