Hi Brian, I would be inclined to leave them in the greenhouse over winter, then harden them off and plant out in spring. They are hardy plants but since you have the greenhouse, it will be a way of keeping them out of the way of slugs during the wet weather to come, especially if the seedlings are still on the small side. All the best, Marissa
I have grown a number of plants from seed (bought at Durham Botanical Gardens). I have a damp shaded area in the garden reserved for them, but I am unsure when to plant them out. I know they flower July onwards, but do I plant them out in the Autumn, or winter them over in the greenhouse and plant out in the Spring? I am based in a hill village just outside Macclesfield so we get frosts early to wards the end of the year and late at the beginning. Any suggestions? Thanks