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Smooth Blue Aster

Symphyotrichum laeve

Smooth Blue Aster

General Information

Smooth Blue Aster is an easy-to-grow, upright herbaceous perennial.

Smooth Blue Aster is typically found in prairies, dry open woods, roadside banks and thickets. It prefers dry to medium soil and full sun.

Smooth Blue Aster purplish-blue daisy-like flowers. Smooth Blue Aster blooms between August and October.

Plant Information

Plant Type:

Herbaceous perennial

Sun Preference:

Full Sun * Part Sun

Soil Moisture Preference:

Medium-Wet * Medium * Medium-Dry

Plant Height:

3 to 4 feet

Plant Width:

1 to 2 feet

Plant Spacing:

1.5 to 2 feet

Flower Color:


Flower timing:

August to October

Culture Information:

Smooth Aster works best in butterfly gardens, native gardens, pollinator gardens, open shade gardens, drought tolerant gardens, in naturalized areas. It can also make an effective border plant.

When first planted, Smooth Aster should be watered weekly for first few months, unless at least an inch of rain has been received in the last week to help it get established. After it becomes established, Smooth Aster does not need watering, as it is drought tolerant.

Smooth Aster can be cut back to the ground in late fall or over winter.


Dry Soil
Shallow-Rocky Soil

Pests & Disease:

Smooth Aster has no serious insect problems.

Smooth Aster has no serious disease problems.

Wildlife Use:

Pollinators: Smooth Aster attracts bees and butterflies. Smooth Aster is a larval host plant for the Pearl Crescent Butterfly. Symphyotrichum species support the specialized bees Andrena asteris, Andrena asteroides, Andrena hirticincta, Andrena nubecula, Andrena placata, Andrena simplex, and Colletes simulans.

Birds: Songbirds and small mammals eat the Smooth Aster’s seeds.

Mammals: N/A.

Other: N/A.

Native to:

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