Yellow bell-like flowers that hang from stalks up to 90-120cm tall. Delicately scented.
A mass planting of this lovely giant cowslip in a bog garden or shady woodland is guaranteed to create a real impact. It is frost-hardy as long as its roots are never allowed to dry out.
Cut back / divide after flowering.
Strong, upright stems topped in summer with long poker-like purple flower heads. Plant in moist boggy soil; ideal on the edge of ponds. Hardy.
Self-seeding and vigorous so divide every couple of years.
Pure white hood shaped flowers with large arrow shaped dark green glossy leaves. Can be grown in an aquatic basket or moist soil around a pond. Half hardy.
Protect with deep mulch over winter.
Prehistoric looking plant. Green stems and black bands. Grows to 120cm tall.
A marginal plant that requires planting in a lined basket as it can be quite invasive.