Ellan are outdoor plants and yes, it is possible for them to change colour with low temperatures but inside they do not adapt, I have already tried like you and it did not work. They are rustic plants and they will hold up... I hope so. It has never been below freezing here, but don't do it!
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Well, if they like outside they indeed have to stay there then, on the balcony 😇
My friend told me it would not be freezing here either 😂 but, that is what came with the cold wave
I think this year's cold snap came later... yesterday it was a bit cold here and now it's getting colder... or is it that I'm already old 🤣