I Just Read An Article About Unheated Greenhouses And Wondered If That Would Work In Zone 3

Question

I live in Eastern Ontario, Canada

Answer 1

It depends on what you are growing, but a tropical plant would not make it through the winter without warmth.

Here are some tips:

https://www.gardeningknowhow.com/special/greenhouses/unheated-greenhouse-growing.htm

https://extension.unh.edu/blog/how-can-i-insulate-my-unheated-greenhouse-during-winter

https://extension.umn.edu/growing-systems/deep-winter-greenhouses