Stipa Species, Giant Feather Grass, Giant Needle Grass, Giant Oats, Spanish Oats

Stipagigantea

Family
Poaceae (poh-AY-see-ee)
Genus
Stipa (STEE-pa)
Species
gigantea (jy-GAN-tee-uh)
Synonym
Lasiagrostis gigantea
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Evergreen
Smooth
Height
6-8 ft. (1.8-2.4 m)
Spacing
4-6 ft. (1.2-1.8 m)
Hardiness
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)
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)
Danger
Plant has spines or sharp edges; use extreme caution when handling
Bloom Color
Cream/Tan
Bloom Time
Mid Summer
Late Summer/Early Fall
Other Details
Category
Ornamental Grasses and Bamboo
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Blue-Green
Where to Grow
Grow outdoors year-round in hardiness zone
Bloom Characteristics
Flowers are good for drying and preserving
Bloom Size
Other details
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
Non-patented
Propagation Methods
By dividing the rootball
From seed; sow indoors before last frost
Seed Collecting
Bag seedheads to capture ripening seed
Regional

This plant is said to grow outdoors in the following regions:

Grand Junction, Colorado

Olympia, Washington

Poulsbo, Washington

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Gardener's Notes:

2
positives
1
neutral
0
negative
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C
ROSLINDALE, MA | November 2015 | neutral

Beautiful grass in flower, especially when backlit by low sun. Hardy on the east coast at least to Z6b, Dartmouth, MA, if drainage is goo...Read More

L
(Zone 7a) | July 2015 | positive

beautiful beatiful beatiful and extremely hardy and foolproof. its big but not too big and is high enough to be in the shrub category. it...Read More

C
| January 2011 | positive

Looks fantastic with Verbena Bonariensis, this plant will flower after year 2, probably year 3. Also a good one to accompany this grass i...Read More

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