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If your greenhouse is not

If your greenhouse is not heated the annual herbs will die and the perennial herbs (like mint) will go dormant. Rosemary is a perennial but very cold sensitive. Bring the rosemary indoors and place in a sunny window. Parsley will also do well in a sunny window indoors. See our herbs page for more specific information about each herb.

http://www.almanac.com/plants/type/herb