Acorus
( ACK - or - us )
At-A-Glance InformationAcorus, also known as Sweet Flag or Calamus, is a genus of perennial grasses that needs ample water and light shade in the hottest climates but can take full sun elsewhere. They can grow in water or in soil, and look like clumps or tufts of grass. Plants are good when used in borders, at edges of pools, in shallow water, or in containers that are kept wet. These plants are native to North America, Asia, and Europe.
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Acorus Species and Varietals
The genus Acorus is a member of the plant family Acoraceae, and includes three species, though there is a good deal of debate concerning the classification of the species in the genus. The best growing zones for Acorus vary by species; for more information, see the descriptions below. To find your zone, click here: Zone Map.
Acorus calamus (Common Sweet Flag, Sway, Muskrat Root) Grows best in zones 2-10 and 14-24. Leaves form in an upright clump about 2 feet wide. Foliage is sweetly fragrant when bruised or crushed, and plants will die back in winter but return in springtime. 'Variegatus' is a popular variety that has white-bordered leaves. Grows from rhizome. |
Acorus gramineus (Japanese Sweet Flag)
Grows best in zones 3b-10 and 14-24; native to Japan and China. Develops fans of semi-evergreen leaves rising from the ends of rhizomes. Spreads by creepers. Varieties are listed below.
Grows best in zones 3b-10 and 14-24; native to Japan and China. Develops fans of semi-evergreen leaves rising from the ends of rhizomes. Spreads by creepers. Varieties are listed below.
Caring for Acorus
Propagation
Problems and Pests
Acorus plants are generally pest and disease resistant, though they can infrequently have issues with the following:
- Slugs and Snails
- Aphids
- Mealybugs
Gallery
The little foliage tufts provided by Acorus contrast well in this bed against Japanese Blood Grass.
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Here, Acorus is planted amongst blue sedge and other low-growing plants.
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Use Sweet Flag in between stepping stones to soften hard edges.
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Acorus naturally grows near bodies of water, and appreciates wet feet.
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Some leaf margins on Acorus plants are wavy.
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This tropical walkway is edged with beds filled with Acorus, Calathea, Cordyline, and Bird's Nest Ferns.
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Videos
Learn about these interesting plants.
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Propagating camellias
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Resources
The New Sunset Western Garden Book: The Ultimate Gardening Guide (2012) - Page 133, Acorus
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