I have a tomato plant in my front yard. It is in 10-15 gallons of soil, I dont really remember what brand but it was the best option I had at the time. It gets full sun from early afternoon till sunset, and is usually only watered with plain water.

About a month ago it started growing tomatoes and not one of them has turned red yet. The plant does not look deficient in any way, other than not ripening tomatoes the plant looks very healthy.

What could be my problem?

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