I tried a few over the years......they can take some cold. One actually survived a warm winter when plastered against a south facing building wall. Anything away from a great microclimate will die but still cool to test. Keep dry in winter.

When I lived in Rhode Island....probably 2002.
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Here's one in my Massachusetts in 2004....in a greenhouse with no sides......BIG mistake with Agaves...check out next photo.
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So called greenhouse protection....LOL
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I Remember a 39" snow storm that year. It was the first season living at my new place. That was a fun Nor-easter to watch, I remember the snow melting very fast even though it was super cold after that storm. Your S. Mag was mini then, amazing how fast it grew over the years.

Bill

Hi Bill,

was today spring fever or what! Providence had a high of 52F.....snow is melting faaaaaaaaaaaaaaast!!

and it is cool to see the Magnolia grow up........I need to know how to propagate that thing.