Lets say you have several gardens but one is a 20 by 60 area that is actuall a greenhouse over the garden! The cover of the greenhouse comes off when frost is past and the garden produces all summer !
As the fall approaches the first plastic cover is put up giving some protection against the frosty nights but not to the extent as to make it too hot! As the temp drops the second cover and the water barrels are filled to etend the crop season maybe with some crops all winter! I do some of that now but mostly in containers. Direct planting into the ground in part of the greenhouse should work. This may b a future trend as writters start to expose the advantage of solar greenhouses! The south insulated wall could be used for climbing vines! My new greenhouse for this coming year is made to work that way! Its ashame that all your summer crops are killed by one night of killing frost especially when the next month starts to get warmer!