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Symphyotrichum laeve

North American native perennial in the Asteraceae that grows 2–4 feet tall, forms a neat clump, blooms late summer to fall with lavender-blue daisy-like flowers, and attracts bees and butterflies.

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Common Names

Smooth Aster, Smooth Blue Aster

Summary

Smooth blue aster is a perennial forb in the Asteraceae native to central and eastern North America. It grows 2–4 feet tall and 1–2 feet wide, with alternately arranged lanceolate to oblong leaves. Flower heads carry 13–23 pale blue to purple ray florets surrounding yellow disk florets, blooming August to October. The plant spreads by creeping rhizomes at a non-aggressive rate and can self-seed in gardens without becoming invasive. It attracts native bees and butterflies and serves as a larval host for the Pearl Crescent butterfly; common habitats include prairies, open woods, and roadsides with full sun and well-drained soils; drought tolerance appears once established.

Ideal for wildflower, native plant, and butterfly-friendly landscapes, it suits borders, meadows, and naturalized plantings, providing late-season color. It tolerates dry to well-drained soils in full sun to partial shade and is not invasive; division or seed-based propagation maintains plantings. Four infraspecific varieties exist (laeve, geyeri, concinnum, purpuratum), and a cultivar such as Bluebird is grown in gardens.

Lifecycle

Perennial

Height

24-48 inches

Spread

12-24 inches

Hardiness Zones

Zones 3-8

Sunlight Requirements

Ideally Full Sun to Partial Shade.

Soil Type

Well-drained loam or sandy loam soil

Soil Drainage

Well-drained soil

Soil pH

6.0-7.5

Acidic to neutral

Bloom Color

Blue

Bloom Time

Late Summer to Fall.

Foliage Color

Blue-green, bluish-green, glaucous, grayish blue, green

Leaf Lifecycle

Deciduous

Growth Rate

Slow

Seasons of Interest

Spring, Summer, Fall, Winter

Propagation Methods

Seeds, Division

Attracts Wildlife

Bees, butterflies, other pollinators, and birds are attracted

References

Symphyotrichum laeve (L.) Á.Löve & D.Löve | Plants…. powo.science.kew.org.
Symphyotrichum laeve. en.wikipedia.org.
Smooth Blue Aster – A Complete Guide (Symphyotrich…. growitbuildit.com.
Smooth Aster. grownative.org.
Symphyotrichum laeve. plantids.com.
Symphyotrichum laeve (Smooth Aster, Smooth Blue As…. plants.ces.ncsu.edu.
[PDF] SMOOTH BLUE ASTER - PLANTS Database. plants.usda.gov.
Symphyotrichum laeve (L.) Á.Löve & D.Löve | Plants…. powo.science.kew.org.
Symphyotrichum laeve | Astereae Lab | University o…. uwaterloo.ca.
Symphyotrichum laeve Smooth Aster. civicgardencenter.org.
Smooth blue aster (Symphyotrichum laeve) Care Guid…. forwardplant.com.
Symphyotrichum laeve. fs.usda.gov.
Symphyotrichum laeve (Smooth Aster). gardenia.net.
Smooth Blue Aster (Symphyotrichum laeve). illinoiswildflowers.info.
Symphyotrichum laeve – Smooth Aster. laurensgardenservice.com.
Plant Finder - Symphyotrichum laeve. missouribotanicalgarden.org.
Symphyotrichum laeve page. missouriplants.com.
Prairie Landscapes of Iowa - Symphyotrichum laeve. prairielandscapesllc.com.
Symphyotrichum laeve Smooth Blue Aster. prairiemoon.com.
Smooth Blue Aster - Complete Guide - YouTube. youtube.com.
World Flora Online. worldfloraonline.org. June 2024.