Black Spot on Bottom of Tomato on Plant

I have a pot on my deck, approximately 12″ W X 13″ D. The tomatoes are about the size of a golf ball and smaller. They are above the ground 3 feet or more. They have a black spot on the bottom which gets bigger and softer, looks like rot. I water them regularly and use Miracle-Grow every 2 weeks. What can I do to prevent this, or is it too late? Please advise.
Thanks
Bill

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1 Comment To "Black Spot on Bottom of Tomato on Plant"

#1 Comment By Becca062 On 07/22/2011 @ 5:20 pm

this may help:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm ^[1]
and this one too:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-diseases.htm ^[2]

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[1] https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm

[2] https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-diseases.htm: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-diseases.htm

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