When to plant is one of the most controversial topics we have living on the coast. The important thing in all planting is to get the new roots growing as quickly as possible so that the plants get hold of the soil in their new quarters. For this warmth and moisture are needed.
The worst and longest periods of gales and stormy weather on the coast are undoubtedly from October to March, so new plantings at that time are a no go.
Spring time proves to be the best. The end of March, beginning of April, is okay providing fertilised peat is well watered in around the plants.