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A picture of a Sweet Flag

Sweet Flag

Acorus spp.

Also known as


Acorus calamus kz1 by Krzysztof Ziarnek, Kenraiz (CC BY-SA 3.0)

Full Sun
Moderate watering
Frost Hardy


USDA zone


Minimum temperature

Expected size





  • spring
  • summer
  • autumn
  • winter

More images of Sweet Flag

A photo of Sweet Flag
A photo of Sweet Flag
A photo of Sweet Flag
A photo of Sweet Flag
A photo of Sweet Flag

Sweet Flag Overview

The genus Acorus contains around 2 semi-evergreen perennial aquatic species growing either submerged or on the margins of water. They produce aromatic foliage and small horn-shaped flowers 5-7cm in length in midsummer. Commonly known as Sweet Flag, they best suit marshy, wet areas and some cultivars are used as aquarium plants.

How to propagate Sweet Flag


Divide the rhizomes at the start of the growing season in spring.


Other uses of Sweet Flag

Grown for their often aromatic foliage. Suitable for water gardens and boggy areas.


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