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Native Wildflower · Easy

How to Grow Tall Ironweed

Vernonia gigantea

Your complete guide to growing Tall Ironweed.

☀SunFull sun to partial shade (4-6+ hours)
💧WaterModerate; drought tolerant once established
🗺Zones5–8
📏Height3-12 feet
Tall Ironweed📷 Wikimedia Commons

When to Plant Tall Ironweed

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

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

Companion Plants for Tall Ironweed

✓ Good companions

Black-eyed Susan

Complements purple blooms with yellow flowers and attracts diverse beneficial insects

Goldenrod

Blooms simultaneously to create pollinator magnet and provides late-season nectar source

Joe Pye Weed

Similar height and bloom time creates butterfly habitat corridor and shares moisture preferences

Little Bluestem Grass

Provides structural support and creates natural prairie ecosystem with complementary root systems

New England Aster

Extends pollinator season into fall and creates dense wildlife habitat together

Purple Coneflower

Shares similar growing conditions and attracts beneficial pollinators while extending bloom season

Wild Bergamot

Attracts butterflies and native bees while sharing preference for well-drained soils

Wild Ginger

Provides ground cover beneath tall stems and attracts different beneficial insects

✗ Keep away from

Autumn Olive

Invasive shrub that creates dense shade and depletes soil nutrients

Crown Vetch

Aggressive spreader that can outcompete and smother native wildflowers

Multiflora Rose

Forms impenetrable thickets that crowd out native plants and reduce biodiversity

Notes from the garden

A greener inbox, occasionally.

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