I believe that there is no good reason to have a glass north wall in a greenhouse used mostly during the winter and spring. The only exception is if it stands in a range of greenhouses with another structure built on the north.
The further north the greenhouse is, the better the reason is for not only an insulated north wall but an insulated north slope for the roof.
Energy conscious, keep in mind that bricks and concrete required heat for their manufacturing. Control of temperatures throughout the life of a protective growing structure - oh yes! Despite all that can be spent on glazing, there isn't all that wonderful of choices for material that allows good light passage while stopping heat loss. It points to sensible use of interior square feet.
No, Paris is not in the "South." If that city was in North America, it would be as far north as the northern border of Maine! When I lived near large commercial peach orchards, it was near the northern border of California. I continue to think that more "north-friendly" apricots and plums are under-appreciated ... but, that is a little off topic
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Somewhere on TEG, I have some pictures of an old greenhouse wall that looks somewhat like the heated fruit wall of Croxteth Hall Walled Kitchen Garden in Liverpool, pictured in the article. Great attention can be placed on a flue running horizontally through those walls. It's like those masonry stoves. I like this idea but it had probably better be backed up since weather conditions can change fairly quickly and something like those walls are probably very slow to heat and slow to cool.
This area would probably be good for building walls because of all the rocks around here. I don't imagine that they would have kept my alien Canadian grandfather from going south in the previous century. He was something of a sun worshipper and recognized that ♪ ♫
It never rains in southern California ♪ ♫ .
オ Steve ツ
