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I "over wintered" a bunch of carrots and I picked on the other day. It was about half grown.
I think it was due to not enough water. I think you put about 1 gallon a day into the stacker gardens, which probably helps a lot.

Yes, my Winter carrots suffered a bit from lack of water too, but they still taste good :)

No, my carrots suffered from lack of water in the summer fall, they seemed to have enjoyed the winter.

Ah gotcha. I planted mine late last Fall.