Easily grown in average, medium, well-drained soil in part shade. Prefers gritty, well-drained soils. Wet soils in winter can be fatal. Removal of flower spikes after bloom will encourage a secondary bloom. If flower spikes are left in place after flowering, plants may self-seed. However the spent flower spikes can rapidly become quite unsightly as the seed develops and many gardeners choose to remove most spikes and leave only a few for self-seeding.