How to grow Sweet william 'Dad's Favourite'
Dad's Favourite is generally regarded as a hardy plant, so it can be safe to leave outdoors for the majority of winter (although if in doubt, using a row cover is often a good idea).
Growing Dad's Favourite from seed
Transplanting Dad's Favourite
Dad's Favourite is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.
Harvesting Dad's Favourite