A large, clump-forming member of the milk thistle family, producing huge, dark blue flower heads, up to 15cm across, on stout grey stems, over beautiful, deeply cut, silvery-green foliage. RHS Award of Garden Merit winner. Flowers July-September. Height 200cm (6'6); spread 1.2m (4'). Back of border variety. Supplied in a 1 litre pot. Supplied as large, well established potted plants that can be planted straight into their final positions in borders or patio containers.