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MelvynForgive my ignorance but I have a question.How much protection from frost do you give C rohlfsianum. I was given some nice forms last year (including some which match those you show,) but I struggled through the harshest part of the winter in my unheated greenhouse. Looks like I lost a couple of plants while others lost leaves but survived. How much water in summer would you advise ... I am growing them alongside C graecum which does well with my care regime.