Photo by Melody

PlantFiles: Skyblue Aster
Symphyotrichum oolentangiense

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Symphyotrichum (sim-fy-oh-TRY-kum) (Info)
Species: oolentangiense (o-luhn-tan-jee-EN-see) (Info)

Synonym:Aster azureus
Synonym:Aster oolentangiensis
Synonym:Aster oolentangiensis var. laevicaulis
Synonym:Symphyotrichum oolentangiense var. oolentangiense

8 vendors have this plant for sale.

4 members have or want this plant for trade.


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12-15 in. (30-38 cm)
15-18 in. (38-45 cm)
18-24 in. (45-60 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
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:
Full Sun


Bloom Color:
Light Blue

Bloom Time:
Late Summer/Early Fall
Mid Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)

Patent Information:

Propagation Methods:
By dividing the rootball
From softwood cuttings
From seed; direct sow outdoors in fall

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

Click thumbnail
to view:

By Terry
Thumbnail #1 of Symphyotrichum oolentangiense by Terry

By Mila1
Thumbnail #2 of Symphyotrichum oolentangiense by Mila1


2 positives
1 neutral
No negatives

Gardeners' Notes:

Positive Mila1 On Sep 29, 2014, Mila1 from Memphis, TN (Zone 7b) wrote:

It's a very pretty native plant. In some states it's endangered. This is a host plant for the the larvae of the Northern Flower Moth (Schinia septentrionalis).

If you happen to see this flower in your yard, please don't mow it down. Move it to another location where you will enjoy the delicate blue flowers.

Positive dkm65 On Jul 23, 2007, dkm65 from Cedar Falls, IA (Zone 4b) wrote:

Small, but abundant vividly blue flowers with yellow centers seem to float from a distance, as the stems are very delicate & the long, narrow leaves are located fairly low on the stems. Blooms from August to first hard frost. Leaves are very scabrous (rough like fine sandpaper). Native to the prairie regions of the U.S., as well as some non-prairie states, it attracts butterflies as well as other pollinators.

Fairly drought tolerant, it will do fairly well in dry to mesic soils. We regularly get specimens in the 4-5' height range in our rich NE Iowa soil. Does not need cold treatment, and in fact we've had fairly poor germination success when we fall sowed the seed compared to spring indoor seeding.

I most often see this listed under the Aster azureus scientific name in native plant nursery lists, and in fact some of the best native prairie nurseries (IMHO) all list it such rather than under the Symphyotrichum genus. I like it intermixed with showy goldenrod (Solidago speciosa), which is a similar height, blooms during the same period, and has a showy golden yellow flower stalk.

Neutral dmj1218 On Jun 12, 2006, dmj1218 from west Houston, TX (Zone 9a) wrote:

Found primarily in the tallgrass prairie of the central U.S., this aster has blue-green, heart shaped leaves on multi-branched stalks. it blooms in the fall, with small daisy-like flowers of brilliant blue with yellow centers. This hardy, versatile aster likes sandy loam but can take heavy soils; is drought tolerant; and grows in full sun to part shade.


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

Cordele, Georgia
Cedar Falls, Iowa
Elsberry, Missouri
Beatrice, Nebraska
North Augusta, South Carolina
Memphis, Tennessee

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