A well known plant from olden days. Ideally put at the back of a border, where its dark blue flower spikes with their white centres will be spectacular. Needs some support. Height 150 cm. Spread 60 cm.
To add an exotic touch to the garden, this plant will produce a magnificent tall, blue flower spikes every second year over silver green foliage. Spikes up to 400 cm. Can be very irritant to the skin.
