I've just started leaving my larger one's in the greenhouse all the time. We had visitors at the weekend so I had to clear them all out from windowsills, shelves etc. I thought they'd be okay but one or two were hit by the severe cold we had the night before last. Seems to be mainly the one's that were either nearest the glass or at floor level, the others were okay.

I have now started to fleece them over at night though and haven't had any further damage since.

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Off to China