@SkirtGardener , I think what you are describing is not too unlike my "unheated high tunnel," except mine is mainly for growing tomato plants in the summer. (I do overwinter a few things in it that wouldn't otherwise survive.) I think what you have described would work perfectly for the type of propagation you are doing; just make sure you have a sturdy framework to support the snow load! You might actually want to consider a clear covering in the winter, so it will warm up enough to shed the snow on its own, and then add a shade covering for the warmer months. I'd love to see what you come up with and how it works out for you - good luck with your project!
