I have a beautiful, large lemongrass plant in a pot that I want to overwinter. I wanted to just cut down the stalks to 3 inches, freeze the stalks and then put the pot in the barn (covered up, of course). What I've read though, is that you must bring it indoors for warmth and south-facing light. Problem is, I don't have a very good light source in the house and what I do have is a north-facing window. Any advice? Thanks!!!