Photo by Melody

PlantFiles: Japanese Rush, Japanese Sweet Flag, Grassy-leaved Sweet Flag
Acorus gramineus 'Hakuro-nishiki'

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

One member has or wants this plant for trade.

Ponds and Aquatics

Unknown - Tell us

6-9 in. (15-22 cm)
9-12 in. (22-30 cm)

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:
Full Sun

Unknown - Tell us

Bloom Color:

Bloom Time:
Mid Spring

Grown for foliage

Other details:
Requires consistently moist soil; do not let dry out between waterings
Very high moisture needs; suitable for bogs and water gardens

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

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

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Click thumbnail
to view:

By Baa
Thumbnail #1 of Acorus gramineus by Baa


1 positive
1 neutral
No negatives

Gardeners' Notes:

Positive hilly8 On Oct 9, 2006, hilly8 from Baltimore, MD wrote:

I am having great success with this plant in Zone 7 (Baltimore, MD); full to part sun, average garden soil, cold hardy; excellent chartreuse accent in full sun; grows in concentric circles.

Neutral Baa On Oct 19, 2002, Baa wrote:

Small perennial cultivar from Japan.

Has fans of linear, yellow to acid green leaves borne in tufts.

Needs constantly moist soil in full sun. It's not fully frost hardy so will need some protection in frost prone regions.

Could be grown in indoor ponds as a marginal plant.


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

Prospect, Kentucky
Baltimore, Maryland

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