Planting up containers and pots for the winter calls for a little forethought and preparation. Firstly you need frost-proof clay, wood or stone containers. No good having a pot crack because it freezes so make sure they have good drainage.
Put some pieces of broken clay pot in the bottom before adding the compost and stand the containers on bricks, clay feet or bits of tile to let them drain freely. Using a free-draining mixture such as John Innes No.1 or No.2 compost will be beneficial, adding some fertilizer/blood fish and bone meal when you plant them up.