So my take on the whole greenhouse debate is that there is simply no way to grow enough food with them in an efficient way so them just being used to grow plats to a small size and then transplanting them outside makes the most sense.

It is theoretically possible to grow crops to full size but it would take a building like a christian cathedral because hat is the only building design I know of that can let in enough light and be strong enough to hold up to winter storms and be something they could actually build but of course this would take a ton of work so if such thing was built it would likely be a holy site where they worship a god of summer and farming.