Answer: Rosemary is generally hardy to about 15 degrees F. It's a tough shrub, but won't survive your winter weather unless you protect it. To be on the safe side, if it's not too large, transplant it to a container and bring it inside, next to a sunny window. It needs well drained soil and frequent watering, and will do best near a humidifier. When the weather warms in spring you could take it out to a porch or deck.
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