Bog arum (Calla palustris) is a good marginal plant for softening edges of ponds.  This native plant has minute greenish flowers on its main spike but is enclosed by a spectacular white spathe from May to August, with clusters of red berries (toxic to young children) from August to November.  Its scent attracts an abundance of wetland flies and beetles.  Full sun or half shade. Can be propagated by division of the rhizome.

A naturalised plant to the British Isles

Height: 15-25cm

Planting position: Pond marginal shelf up to 15cm deep or very wet soil

Form: Bare root

Recommended basket size min./ideal: 2.5 litre shallow square/3.5 litre round