Calla palustris – Bog arum

Height: 15-30cm (6-12in)

Water depth: 5-10cm (2-4in)

Features: flowers spring to summer

Soil: fertile

Site: sun or partial shade

Type: marginal

Bog arum (Calla palustris) can enhance and conceal the edge of a pond. Its creeping, fleshy rhizomes give rise to thick, glossy, heart-shaped leaves which stand 15-30cm (6-12in) high.

Flowering starts in late spring and continues through early summer, with each small, white, arum lily-like bloom lasting for a couple of weeks. Sometimes there may be a second show of flowers in late summer.

If pollinated by water snails, the flowers are followed by clusters of bright red berries.

Cultivation

Plant bog arum in late spring in fertile soil up to a water depth of 10cm (4in) in sun or partial shade.

Propagation: Divide and replant mature or crowded clumps in mid spring, or sow seeds in autumn. It is also possible to propagate plants by cutting the creeping stems into small sections. Each section should have a bud. These are planted in trays of mud.

Pests and diseases: Trouble free.

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