Well my opinion is if you leave pelargoniums in a cold greenhouse over winter expect to lose them-as for wrapping them in bubble wrap that will just cause them to rot-quite often it is not the cold but the cold and wet that kill plants over winter-but pelargoniums are either best discarded or kept indoors in a cool room
What works for some will just not work for others.
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Well my opinion is if you leave pelargoniums in a cold greenhouse over winter expect to lose them-as for wrapping them in bubble wrap that will just cause them to rot-quite often it is not the cold but the cold and wet that kill plants over winter-but pelargoniums are either best discarded or kept indoors in a cool room
What works for some will just not work for others.