Q.My one tomato is black on the bottom. How come?
I have one tomato plant that has good size tomatoes but the under side is black where the top is fine.

Downtoearthdigs
Answered on July 22, 2019
This is Blossom End Rot and is from a lack of calcium.
This article will help you.
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm
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