| Why not post your question on the American forum? Many more people with experience of severe winters and growing indoors. You could do some browsing there, using the search facility, because such questions have been asked many times, with plenty of useful responses. One key word you could try is 'overwintering'. I know you'll need not only to provide sunlight, but also warmth and a certain amount of humidity. And get them outside as quickly as you can in spring. |
Here is a link that might be useful: US herbs forum
