A large leaved, frost-hardy perennial that takes on a "thistle-like" form (only without the prickles!) as it grows, reaching a height of around 6 feet (2 metres) and flowering the same year, if well fed and watered. It may need an occasional tidy by simply snapping off any dead lower leaves. The silvery blue foliage dies back in the Winter, (returns in the Spring) leaving behind bare woody branches with spikey seed heads, which can be used in a dried flower display.
This striking architectural plant is best planted out after the last frosts, around late May. Choose your planting site carefully, as this plant has thick roots, and once established is difficult to move.