Hydrangea shrubs are popular ornamental plants grown for their large flowerheads. Hydrangea macrophylla is the most popular and most widely grown cultivars. Some are best pruned on an annual basis when the new leaf buds begin to appear. There are many uses for the hydrangea plants, and one of the most spectacular is hedging. Be imaginative and have one of the most colourful hedges – a fantastic mixture of colours!