Bulb Snakeshead planting

I have some Snakeshead bulbs that rather than plant out in the garden and risk disturbing bulbs already insitu and overplanting, I plan to pot up in small pots, say 3 to a pot , over winter them and then plant them out where I can see suitable spaces. Question is once potted do I just leave them out in a sheltered place in the garden but open to all weather or put them in the unheated greenhouse with some sort of watering regime??? Thoughts please. Thanks
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I'm assuming you mean snakeshead fritillaries?
I live in west central Scotland - not where that photo is...