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many thanks a_nigma, will try sequestrene, yes the leaves look lovely and heathy and it has only rain water, it has been in the same size pot ( 12") all the time, so maybe I should treat it to a larger one now, you are right about the frost I remember putting fleece round the mother plant (10yrs ago) and had not thought to do the same with the young one as we have had such mild winters in recent years, but will do so next winter and hope for the best.