Photo by Melody

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

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

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One member has or wants this plant for trade.

Ornamental Grasses and Bamboo
Ponds and Aquatics

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)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

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:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

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No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral keferraro On Jun 24, 2013, keferraro from Crown Point, IN wrote:

As one of the pictures is captioned, this is a sloooow grower. I just moved it this weekend because I thought maybe it was not happy where it was, which was literally in the clay muck at the edge of the pond in full sun. I had to literally dig my fingers under it and extract it from the muck and was surprised to see that it has thick green rhizomes that connected the various tufts of foliage. It is now higher up on the bank in mostly shade. The growth habit of this plant is rather recumbent and so far I have not had any substantial bunches of foliage but rather sparse bunches that sprout along the length of the rhizome. It grows to 8" long and is hardy in zone 5.


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

Crown Point, Indiana
Elizabeth City, North Carolina
Emerald Isle, North Carolina
Mountlake Terrace, Washington

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