Japanese Rush, Japanese Sweet Flag, Grassy Leaved Sweet Flag 'Variegatus'

Acorus gramineus

Family: Acoraceae
Genus: Acorus (AK-or-us) (Info)
Species: gramineus (gram-IN-ee-us) (Info)
Cultivar: Variegatus


Ornamental Grasses and Bamboo


Ponds and Aquatics

Water Requirements:

Requires consistently moist soil; do not let dry out between waterings

Very high moisture needs; suitable for bogs and water gardens

Sun Exposure:

Sun to Partial Shade


Grown for foliage


Good Fall Color


Foliage Color:

Unknown - Tell us


6-12 in. (15-30 cm)

12-18 in. (30-45 cm)


9-12 in. (22-30 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)

Where to Grow:

Unknown - Tell us


Unknown - Tell us

Bloom Color:



Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Other details:

Unknown - Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

Patent Information:


Propagation Methods:

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

Seed Collecting:

Unknown - Tell us


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

Fullerton, California

Hayward, California

Knights Landing, California

Iowa City, Iowa

Ewing, Kentucky

Prospect, Kentucky

Elizabeth City, North Carolina

Emerald Isle, North Carolina

Greenville, North Carolina

Quakertown, Pennsylvania

Columbia, South Carolina

Okatie, South Carolina

Arlington, Tennessee

Melfa, Virginia

Concrete, Washington

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Gardeners' Notes:


On Nov 7, 2012, windsor224 from Haycock,Bucks County, PA (Zone 6b) wrote:

I love this plant and it grows without any special attention. I just wish it didn't die out in the center which makes it a bit unattractive to look down on. I just started pulling out pieces from around the edges and planting it in other areas of the yard. I don't expect to have any problems with it taking hold and growing.


On Oct 15, 2012, BayAreaTropics from Hayward, CA wrote:

This plant has held it's own over the years for me potted with the Fuschia 'Gartenmeister bonsted' in a 12" pot. It and the Fuschia will soon go in ground.
Its does like much water..can get by though on not much. That's pretty good for a water's edge plant. And occasional fertilizer really helps to break it out of just sitting in the pot with bonsai like growth. And for a shade plant,it doesn't seem attractive to slugs and snails.
Try it!


On Jan 2, 2011, sueroderus from Bluffton, SC (Zone 8b) wrote:

This plant is evergreen in my zone 8b garden. It does well in shade or part shade but gets burned in full sun or afternoon sun. Maybe with more water it would not burn. Acorus is deer and rabbit resistant in my garden.


On Sep 6, 2008, pyromomma from Columbia, SC (Zone 7b) wrote:

just got this in Columbia SC to plant in my bog garden.

From Classy Groundcovers website:
"A fine-bladed rush-like grass with green and white striped, 1/4" wide leaves - evergreen in southern zones. Non-invasive rhizome grass. Numerous sedge-like spikes of tiny, densely-packed, yellow flowers appear in late spring to early summer. Flowers give way to tiny reddish fleshy berries. Requires moist soil; good bog plant.

Striking foliage provides wonderful color and texture for gardens. An excellent ground cover for open woods, at water’s edge, and in ponds or water gardens in up to 4 inches (10 cm) of water. Excellent for erosion control along the banks of streams and ponds. Slow to moderate growth rate. Occasional foot traffic is tolerated. Mature height 6-... read more