Herbs and Medicinal Uses

I've pretty much shut down the greenhouse for the year now that we've had a couple of really cold periods of weather. During the day it would heat up just perfect and at night it still stays about 25 degrees warmer than the outdoor temperature. But when its 4 below zero outside and 24 inside, it's still too cold for tomatoes and peppers. Right now all that is left is the herbs. They can take some colder temperatures for short period and do just fine. So the rosemary and chamomile are still alive. I'll cut all the chamomile today and dry it for tea. Since the rosemary has to last through the...