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PlantFiles: Smooth Aster, Smooth Blue Aster
Symphyotrichum laeve 'Bluebird'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Symphyotrichum (sim-fy-oh-TRY-kum) (Info)
Species: laeve (LEE-vey) (Info)
Cultivar: Bluebird

Synonym:Aster laevis

3 vendors have this plant for sale.

6 members have or want this plant for trade.


36-48 in. (90-120 cm)

24-36 in. (60-90 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
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)

Sun Exposure:
Full Sun
Sun to Partial Shade


Bloom Color:
Light Blue

Bloom Time:
Mid Summer
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
Self-sows freely; deadhead if you do not want volunteer seedlings next season

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
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
From seed; sow indoors before last frost

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Click thumbnail
to view:

By bigcityal
Thumbnail #1 of Symphyotrichum laeve by bigcityal

By yvana
Thumbnail #2 of Symphyotrichum laeve by yvana


2 positives
1 neutral
No negatives

Gardeners' Notes:

Positive coriaceous On Sep 29, 2014, coriaceous from ROSLINDALE, MA wrote:

This is one of the best asters for the northeastern US. Medium violet-blue 1 1/4 to 1 1/2" flowers in profusion from mid September to mid October. Smooth, blue-green foliage that's generally free of the diseases that commonly afflict aster here, and does not defoliate at the base.

I find that, like most tall asters, this comes in more densely and is less likely to need staking if cut back by a third in late spring.

This got the highest rating for landscape performance of the 56 asters evaluated by the Mt. Cuba Center in their 2006 report, tied with turbinate aster, S. turbinellum.

Neutral berrygirl On Mar 19, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:

Tall 4' Plant 20" apart. zone 4-9 End of season flowering for Northern gardens. Superb in warmer areas. Deep sky blue flower clusters in profusion a top vase-shaped plants. Perfect form of our native asters.
Very late bloomer.

Positive yvana On Dec 14, 2002, yvana from Stone Mountain, GA (Zone 7b) wrote:

Mildew Resistant


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

Cornwall Bridge, Connecticut
Stone Mountain, Georgia
Roslindale, Massachusetts
Uxbridge, Massachusetts
Portage, Michigan
Florence, Mississippi
Mount Laurel, New Jersey
Cincinnati, Ohio
Kintnersville, Pennsylvania
Saint Helena Island, South Carolina
Knoxville, Tennessee

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