Acorus americanus - Sweet Flag

Sweet Flag

Acorus americanus

Also called American Sweetflag, Several-Veined Sweetflag

  • Hardy perennial, swamp or bog plant
  • Foliage and rhizomes have a sweet citrus scent when bruised or cut
  • Wheat-like flowers
  • Great for stabilizing pond edges
  • Bloom Time: June to July



60-90 cm

70-90 cm

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Growing and Maintenance Tips:

Grow in a moist to wet soil, in full sun or partial shade. Spreads quickly by rhizomes and works well for retaining soil at the edge of streams and ponds. Can tolerate periods of drought, but suffers in appearance. 

Additional Notes about Sweet Flag:

Native to Ontario and much of Canada

Widely confused with the European strain Acorus calamus, it can be easily identified by the distinct ribs on the leaves. Acorus calamus has one midrib and Acorus americanus have several. Both species have naturalized throughout North America. 

Acorus americanus was used by Native Americans as a replacement for ginger, cinnamon, and nutmeg. The rhizomes were also used in perfumes.