Photo by Melody

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

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

9 vendors have this plant for sale.

15 members have or want this plant for trade.

Ponds and Aquatics

6-12 in. (15-30 cm)

9-12 in. (22-30 cm)

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)

Sun Exposure:
Partial to Full Shade

All parts of plant are poisonous if ingested

Bloom Color:
Chartreuse (Yellow-Green)

Bloom Time:
Late Spring/Early Summer

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:
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

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There are a total of 11 photos.
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7 positives
No neutrals
No negatives

Gardeners' Notes:

Positive coriaceous On Jan 21, 2014, coriaceous from ROSLINDALE, MA wrote:

A beautiful, easy, evergreen foliage plant. The chartreuse variegated leaf blades glow. Clump-forming.

We've used this to edge an irrigated rose garden in Massachusetts Z6a. Clumps are quick growing where happy, but not aggressive. Requires consistent moisture to keep leaf tips from browning, but it doesn't require wet soil, and it does well in full sun as long as it never gets too dry at the root.

This was used in traditional herbal medicine, but is both toxic and carcinogenic if ingested.

Easily propagated by division.

Armitage says this is hardy in Z5.

Positive Biker1 On Nov 10, 2009, Biker1 from McLean, VA (Zone 7a) wrote:

I planted this on the bank of a stream leading into a pond. It makes a nice, low, glowing focal point. It is also a very dense clump that prevents erosion and weeds.

Positive hanna1 On Dec 16, 2005, hanna1 from Castro Valley, CA (Zone 9a) wrote:

Growing well in a full sun or light shade area. Great along pathways and borders, can also be used for accent planting in a rockery. It's strap-like leaves emit a sweet scent when bruised or crushed. Needs good air circulation. Keep plant constantly moist to avoid the leaves developing burnt tips.

Positive Shadyfolks On Apr 29, 2005, Shadyfolks from Chesterland, OH (Zone 5b) wrote:

I have to agree, this is a great plant. It will live in an area that is not constantly wet, but if you want it to thrive and grow make sure it gets lots of moisture. I have this variety planted next to our creek and it is extremely happy. I have another variety planted in a relatively dry but low area, so it collects the rain run off in the yard and stays damp longer there. It live and grows just a little very year, but does not thrive like the one on the creek's edge. This plant does not seem to mind that it is in Z5 (with lots of snow cover). Great plant 12 months of the year. As a matter of fact I just saw yesterday an all green mini acorus in a local nursery that only gets 2-4" tall. I will have to pick up.

Positive henryr10 On Apr 28, 2005, henryr10 from Cincinnati, OH (Zone 6b) wrote:

This is a very nice addition to add winter interest to the pond.
Not to say that it's not a great plant the rest of the year but green in winter...................
It spreads rapidly but is not really invasive in our climate.
I find it does very well in containers and just regular garden soil.
Come Spring just un-pot slice into quarters repot the divisions.
By mid Summer it's again filling the pots.
I've given away tons of this plant.

Positive pottingsisters On Apr 21, 2004, pottingsisters wrote:

Wonderful plant - we use it extensively for color and texture in our container garden plantings. We find it does not require as much moisture as suggested - altho we flood our pots when watering. However, we have not used in boggy areas or wetlands, along streams as suggested. This is a plant we would not be without.

Positive wnstarr On Mar 19, 2004, wnstarr from Puyallup, WA (Zone 5a) wrote:

Edgewood, Washington
Nice plant for the edge of a pond. It is short and compact, adds a ray of sunshine to all the green around the ponds.


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

Birmingham, Alabama
Eclectic, Alabama
Tuscaloosa, Alabama
Castro Valley, California
Clayton, California
North Fork, California
San Bernardino, California
San Leandro, California
Denver, Colorado
Lula, Georgia
Chicago, Illinois
Ewing, Kentucky
Annapolis, Maryland
Roslindale, Massachusetts
Pass Christian, Mississippi
Fishkill, New York
Elizabeth City, North Carolina
Chesterland, Ohio
Cincinnati, Ohio
Cleveland, Ohio
Portland, Oregon
North East, Pennsylvania
Florence, South Carolina
Arlington, Texas
Fort Worth, Texas
Rowlett, Texas
Ogden, Utah
Leesburg, Virginia
Lexington, Virginia
Mc Lean, Virginia
Kirkland, Washington
Langley, Washington
Puyallup, Washington
Vancouver, Washington

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