They are fully to frost hardy and will require a sunny warm position with well drained soil. Provide a covering of dry bracken in late winter to protect the crowns when shoots are first developing. Stake tall species and hybrids.
Plant your crowns in the autumn about 4 inches below the soil surface. Roots are extremely brittle, so take care when planting and do not disturb once you have planted them.
Pests, diseases or disorders
Susceptible to slug damage.