Store in a cool, dark place or the fridge. If left uncut and loosely wrapped in plastic, a green cabbage will keep for a week or two. However, eat green cabbage as fresh as possible as it loses nutrients if stored for too long. Once cut, wrap the unused portion in cling film and store in the salad drawer of the fridge. Use within a day or two.
To freeze green cabbage, wash it thoroughly, shred finely and blanch for two minutes. Drain, plunge into ice water, then drain again and pack into polythene bags. Cook from frozen in boiling, salted water.