Acorus calamus

Sweet flag

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Key information

Plant type

Native aquatic



Skill level


photo by Andrea Jones, copyright GAP Photos (32879)

Plant details

This rhizomatous, deciduous marginal is a useful addition to the pond. A spreading aquatic perennial, the plant has strap-shaped, aromatic bright green leaves that have an aroma of tangerine when crushed. The insignificant, horn-like brown flowers appear mid-summer. Plant as a marginal or in water no deeper than 22cm. The iris-like leaves work well with contrasting leaf shapes such as rodgersia.

Family: Araceae

Genus: Acorus

Species: calamus

Plant type: Native aquatic

Foliage colour: Dark green

Sun exposure: Full sun

Soil: Boggy

Hardiness: Hardy

Skill level: Beginner

Height: 90cm

Spread: 60cm

Time to divide plants: March to May

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