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Native Wildflower · Easy

How to Grow Smooth Blue Aster

Symphyotrichum laeve

Your complete guide to growing Smooth Blue Aster.

☀SunFull sun to partial shade (4-6+ hours)
💧WaterModerate — regular watering
🗺Zones4–8
📏Height2-4 feet
Smooth Blue Aster📷 Wikimedia Commons

When to Plant Smooth Blue Aster

Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.

ZoneStart IndoorsDirect SowHarvest
Zone 4 — April – June —
Zone 5 — April – June —
Zone 6 — April – June —
Zone 7 — March – May —
Zone 8 — March – May —

Companion Plants for Smooth Blue Aster

✓ Good companions

Black-eyed Susan

Complementary colors and bloom times, attracts beneficial insects and butterflies

Goldenrod

Blooms simultaneously, creating mass pollinator habitat and complementary yellow-blue colors

Joe Pye Weed

Attracts butterflies and provides height variation while sharing moisture preferences

Little Bluestem Grass

Provides structural support and creates natural prairie-like conditions

New England Aster

Similar growing requirements and extends aster blooming period with different timing

Purple Coneflower

Shares similar growing conditions and blooms at different times, extending pollinator season

Wild Bergamot

Both attract native pollinators and have similar water and soil requirements

Wild Ginger

Serves as living mulch at base, retaining moisture and suppressing weeds

✗ Keep away from

Aggressive Grasses

Compete heavily for nutrients and can crowd out aster seedlings

Autumn Olive

Invasive shrub that outcompetes native plants for light and nutrients

Black Walnut

Produces juglone which is toxic to asters and inhibits their growth

Notes from the garden

A greener inbox, occasionally.

Seasonal planting ideas, useful tips and a little inspiration. No weeds.