You've probably seen or heard it mentioned, but if not, an
excellent resource on the subject is Elliot Coleman's book
Four Season Harvest..He shows how to harvest and grow crops
through his very cold Maine winters using a hoophouse com-
bined with floating row covers and coldframes..If your mov-
ing to zone 7 you'll have even more options and success.
He (Elliot Coleman) uses no supplemental heating or lighting.
Good luck!!

Swanz

Fruiting veggies need more daylength than root or leaf crops.

Byron

Yeah, and they probably need more heat also.

Swanz

Northern part's of the US are actually at about the same
lattitude as parts of balmy southern France. We get the same
amount of sunshine but colder temps.

Swanz

And if you read Elliott Coleman's book, you'll learn that you need to get the plants in good growth before daylength really gets short. Then in the hoophouse, they just stay alive, without growing much more over the winter, but are still fresh for harvest.

But for early spring growing (March 21= September 21 for daylength), if you start plants indoors with supplemental light, then put them outside with a hoophouse or coldframe to warm up soil and air,they will take off quickly.

BTW, parsley, cilantro, greens (lettuce or kale) can survive outside with no protection till Thanksgiving or beyond in z7a. Especially if in a south-facing area, with rocks or brick to hold heat.