Smooth blue aster (Symphyotrichum laeve)

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Smooth blue aster

Habit (mature) · Dušan Kreheľ / Wikimedia Commons · CC0

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Smooth blue aster

Symphyotrichum laeve

A native North American perennial with smooth blue-green foliage and clouds of small blue-violet starry flowers in fall. Tolerates drought + clay; among the most adaptable native fall asters for residential landscapes.

Native: 47 US states + 9 CA provinces

Review: Source-backed

Climate fit: broad (76/100)

Pollinator

Border

Light

Full sun

Water

Moderate water

Mature size

24-48" tall · 24" apart

Hardy in zones

4a-8b

very cold to frosty winters

Summer heat range

Cool-Hot

cool to hot summers Interim Plotwright tier until the plant AHS range is authored.

Native in Illinois

Yes

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Drainage and aeration

Perlite, pumice, raised-bed mix, aerators, and drainage-focused containers.

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Transplanting and establishment

Trowels, transplant spades, starter fertilizer, root stimulators, and watering bags.

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Pest and disease monitoring

Sticky traps, hand lenses, sprayers, disease-monitoring tools, and pest barriers.

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Plant support

Stakes, cages, trellises, ties, clips, arbors, and heavy-duty supports.

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Pruning and deadheading

Pruners, snips, loppers, pruning saws, sharpening tools, and cut-flower shears.

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A documented larval host for the Pearl crescent — caterpillars feed on its foliage before becoming the next generation.

Wildlife relationships

Cold hardiness

Now

Zone 6b

USDA

Chicago, IL · 1991-2020 average annual coldest day

Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer

Well-suited

2050

Zone 7b

Plotwright

Your zone + climate-model shift · SSP3-7.0 (regional rivalry)

Well-suited

In plain terms: cold winters — coldest nights typically around -3°F.

✓

Well-suited today and still thriving in 2050.

Heat tolerance

°C

°F

Loading current AHS heat-zone and plant heat-fit data at your coordinates…

Where this plant fits

Suitable across 40 ecoregions — 35 climate-resilient through 2070 · 5 suited today. Best matches first.

Appalachian mixed mesophytic forests

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Appalachian-Blue Ridge forests

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Arizona Mountains forests

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Blue Mountains forests

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Canadian Aspen forests and parklands

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Central Pacific Northwest coastal forests

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Central Tallgrass prairie

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Central-Southern Cascades Forests

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Colorado Rockies forests

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Cross-Timbers savanna-woodland

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Appears in collections

Collection · 9 plants

Native pollinator border (eastern US)

A continuous-bloom native pollinator strip for eastern North America. Covers spring through frost with host + nectar plants spanning monarchs, native bees, hummingbirds, and specialist Lepidoptera. Little bluestem provides the matrix grass + Hesperiidae host.