Posted: 07/03/2014 at 09:10
They get very large as they mature if they like their situation and make bold, dramatic plants. They like their soil to be damp and can grow in full sun if it's moist enough for them not to dry out at the roots.
They are not very frost hardy so for the first few years it's often a good idea to grow them in pots, increasing the size as they grow and then take them into shelter for winter. After that, you can plant them out and then protect the crown in winter by covering it with some of its old leaves folded over and then a pile of garden compost to keep the frosts at bay.