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Achnatherum coronatum (Thurb.) Barkworth
Giant rice grass, Giant ricegrass, Needle-and-thread grass
Poaceae (Grass Family)
Synonym(s): Stipa coronata
USDA Symbol: ACCO21
USDA Native Status: L48 (N)
Giant rice grass or needle-and-thread grass is a medium-sized, cool-season, perennial bunchgrass with seed stalks 1-2 ft. tall and mostly basal leaves. Sharp-pointed seeds have twisted, flexible awns extending outward 4-5 in. Leaves are usually 8-12 in. long often dying back at the tip.
Bloom InformationBloom Color:
Not Applicable Bloom Time:
Apr , May , Jun Bloom Notes:
(flowers) of grasses are usually so minute that they are not visible to the naked eye. The panicle
of this grass is purplish.
DistributionUSA: CA Native Distribution:
B.C. to CA
(east of the Cascades), e. to MN
& TX Native Habitat:
Gravelly, rocky slopes, chaparral
Growing ConditionsWater Use: Low
Light Requirement: Sun
Soil Moisture: Dry
Drought Tolerance: High
Soil Description: Coarse and medium-textured, well-drained soils.
Conditions Comments: Needle-and-thread grass is very drought tolerant. The short-lived grass is extensively used for revegetating drastically disturbed sites and blow-out areas.
PropagationDescription: Sow seed.
Seed Collection: Not Available
Seed Treatment: Germination is enhanced by acid scarification, but this treatment is not necessary.
Commercially Avail: yes
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Santa Barbara Botanic Garden
- Santa Barbara, CANative Seed Network
- Corvallis, OR
Record Last Modified: 2007-01-01
Research By: TWC Staff