Photo by Melody

PlantFiles: Tuber Oat Grass, Bulbous Oat Grass
Arrhenatherum elatius var. bulbosum

Family: Poaceae (poh-AY-see-ee) (Info)
Genus: Arrhenatherum (ah-ren-AH-ther-um) (Info)
Species: elatius var. bulbosum

Synonym:Arrhenatherum elatius subsp. bulbosum
Synonym:Arrhenatherum elatius var. tuberosum

Ornamental Grasses and Bamboo

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)

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Grown for foliage

Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us


1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive wakingdream On Oct 5, 2010, wakingdream from Allentown, PA wrote:

In southeastern PA I found this plant on our property when we moved here in 1990. After 20 years it is still going, having been moved at least 3 times. It is a short, early, striking grass, soft to the touch and very attractive. It held on being stuck under a privet hedge that sucked all moisture away. It held on being placed in heavy shade, far away from the water source. It held on in a very moist spot near a birdbath (getting dumped and refilled for weeks) with afternoon shade but bright morning sun. It held on getting surrounded and obscured by taller self sowing cottage garden annuals. I have just recently moved it to a fresh spot where it can get more even light, less swampy conditions and have room to expand a bit. The interesting root system (bulbous nodules stacked together resembling caterpillar sections) makes it easy to identify here. With a scorching hot summer, Arrhenatherum will go dormant in high summer and return in the fall to mark itself. The stripes are eye catching and the texture is pleasing. Height is about one foot before bloom. Sorry my photo is not better. Next year I'll try for a nicer shot.


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

Allentown, Pennsylvania

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