I want to bring some herbs in for the winter, not to use in cooking so much, but so that they can survive the winter. Some of them are borderline hardy in my zone (5-6 ) and do not always survive the winter, such as sage and rosemary. I have a southern exposure, unheated sunporch that gets full unobstructed sun all day. It does get very cold in this room. but not below freezing. Will not keeping these herbs in this room be the same as keeping them outside, simulating winter in a slightly higher zone and thereby providing conditions for survival?
That should work well for the Rosemary as long as you can control the moisture. It tends to dry out much more quickly than most people think. On the other hand you can rot the roots if it's too wet. Sage should be fully hardy for you so I suspect you have drainage or other issues killing it. http://www.vegetablegardener.com/item/2643/how-to-grow-sage
