In America, food options are remarkably unaffected by the changing seasons. We just keep eating salad greens and tomatoes without regard to the onset of winter.

In most of the country, there's little chance that the greens we eat in the late fall and winter are locally grown.

But if there were greenhouses nearby, they could be. And in a small but growing number of places, local greenhouses are there.

Take Lower Makefield Township, Penn., right across the Delaware River from Trenton, N.J.

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