Photo by Melody

PlantFiles: Japanese Rush, Golden Japanese Sweet Flag, Grassy-leaved Sweet Flag
Acorus gramineus

Family: Araceae (a-RAY-see-ee) (Info)
Genus: Acorus (AK-or-us) (Info)
Species: gramineus (gram-IN-ee-us) (Info)

One member has or wants this plant for trade.

Ponds and Aquatics

12-18 in. (30-45 cm)

6-9 in. (15-22 cm)

USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Pale Green

Bloom Time:
Mid Summer
Late Summer/Early Fall

Grown for foliage

Other details:
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
Provides winter interest

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By Dynamo
Thumbnail #1 of Acorus gramineus by Dynamo

By jody
Thumbnail #2 of Acorus gramineus by jody

By mgarr
Thumbnail #3 of Acorus gramineus by mgarr

Thumbnail #4 of Acorus gramineus by BUFFY690


2 positives
3 neutrals
No negatives

Gardeners' Notes:

Positive hmbgerl On Jun 15, 2010, hmbgerl from Folsom, CA wrote:

I divided into two before planting. In less than a year, both sections have doubled and I'm ready to divide again. It's a nice contrast near rocks or dark foliage and it looks good against mulch. I have the dwarf species so it is compact and doesn't take over my garden.

Positive mgarr On Jan 16, 2005, mgarr from Hanover Twp., PA (Zone 6a) wrote:

I know that this plant should have moisture but thank goodness plants can't read what we write about them. Mine is in part sun growing under an oak tree along the sidewalk. I give it no extra water and it has done fine in this spot for three years now.

Neutral Dynamo On Mar 5, 2002, Dynamo wrote:

One of the most striking and certainly the cutest of the sweet flags, this dwarf golden form makes a slowly spreading tuft of tiny golden evergreen grass-like foliage. A. 'Minimus Aureus' makes a bright little groundcover in moist areas or a feature between stepping stones... a real highlight in the woodland garden.

Neutral smiln32 On Aug 31, 2001, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

Easily grown in average, medium wet to wet soils in full sun to part shade. Grows well in both boggy conditions (including very shallow water) and consistently moist garden soils. Scorched leaf tips will occur if soils are allowed to dry out. Appreciates some relief from hot summer sun (e.g., afternoon shade or filtered sun) when grown in hot summer climates. Slowly naturalizes by spreading roots, but is not invasive. May not be reliably winter hardy in the northern areas of USDA Zone 5. Evergreen in warm winter climates.

Neutral jody On May 25, 2001, jody from MD &, VA (Zone 7b) wrote:

There are only 2 species in this genus of grass like evergreen perennials from stream banks and marshes in the northern hemispere.

This species is native to Janpan and has soft, curved leaves under 12" long and about 1/4" wide. The flowers spikes are about 1" long and appear in spring and summer. Sweet flags are easily grown in any boggy spot or in shallow water at pond edges. They need no maintenance except for cutting back to limit their spread.


This plant has been said to grow in the following regions:

Folsom, California
Marietta, Georgia
Wilkes Barre, Pennsylvania
Missouri City, Texas

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