Plant into a well-prepared border or woodland margin with plenty of organic matter (well-rotted compost). Ensure that the soil is kept moist in summer.
After the first flowerspikes have finished flowering, cut them back to encourage sideshoots to develop, which can go on to provide a second flush of flower. Then, when the last of these have died off, cut them all down to the ground.
Apply a generous 5-7cm (2-3in) mulch of well-rotted organic matter around the plant in early spring.
These plants are mainly biennial, although they will often self-seed freely.