For best performance choose a sunny position in fertile, well-drained soil that won’t get too wet over winter. Water at least once a week until established and during warmer periods, once established they are fairly drought tolerant. Remove dead flower stems to prolong flowering. Once flowering has finished leave the plants alone until mid-spring as the old growth will protect the crown of the plant. Once the weather has begun to warm up, any dead or untidy-looking foliage can be pulled away – this will provide the opportunity to check for slugs and snails which can damage developing flowerheads and young growth.