Sweet Flag
Acorus Calamus
Overview
Sweet Flag (Acorus calamus) is a perennial marsh plant featuring sword-shaped leaves and a fragrant, spicy aroma. It typically grows 2-4 feet tall and thrives in wet soils, often along edges of ponds and streams. Ideal for water gardens, Sweet Flag's green-yellow flowers bloom in early summer. Zones 4-10 suit it best, and it prefers full to partial sun. Notable for its ease of care and rhizomatous growth.
Sun Half, ShadeWater HighZones 4–10Type Grass
Culture
- Sun
- Half, Shade
- Water
- High
- USDA zones
- 4–10
Shape & size
- Mature height
- 2–3 Ft.
- Mature width
- 1–2 Ft.
Classification
- Type
- Grass
- Family
- Araceae
See full data, regional cultivation notes, and design tools. Build a client presentation around this plant.
Start your 14-day trialPhotos (80)
























Photographs by 11 contributors
- coenobita, CC BY 4.0 · source
- Stefan.lefnaer, CC BY-SA 4.0 · source
- Krzysztof Ziarnek, Kenraiz, CC BY-SA 4.0 · source
- John Jennings from Adelaide, Australia, CC BY 2.0 · source
- David J. Stang, CC BY-SA 4.0 · source
- Krzysztof Ziarnek, Kenraiz, CC BY-SA 3.0 · source
- Tim from Ithaca, CC BY 2.0 · source
- Wilhelm Zimmerling PAR, CC BY-SA 4.0 · source
- Atudu, CC BY-SA 4.0 · source
- Dr. John Dransfield, CC BY 4.0 · source
- Matthew Borella, CC BY 4.0 · source
Related plants

Adansonii Swiss Cheese Vine
Monstera adansonii
Half

Perennial
Bird's Nest Anthurium
Anthurium Hookeri
ShadeUSDA 10–11

Shrub
Black Magic Taro
Colocasia Esculenta 'Black Magic'
ShadeUSDA 9–11

Blackout™ Zebrina Black Stem
Alocasia zebrina
Half

Blushing Bride Sun or Shade Caladium
Caladium hortulanum

Bold Forest™ Chinese Evergreen
Aglaonema x
Half