A hardy evergreen perennial with ivy shaped leaves that displays 300-400mm high spikes of white star shaped flowers from June to September, and is often used in rock gardens or as ground cover beneath trees.
They should be planted out in October approximately 300mm apart in ordinary garden soil. They should never be allowed to dry out.
wherryi; does not divide easily so is best increased by sowing seed.
Sow seeds in a tray of seed compost in March and place in cold frame to germinate.
Prick out seedlings into trays of potting compost when large enough to handle, and grow on in a cold frame or nursery bed, until planting out time the following March.