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Native Wildflower · Easy

How to Grow Whorled Milkweed

Asclepias verticillata

Your complete guide to growing Whorled Milkweed.

☀SunFull sun to partial shade (4-6+ hours)
💧WaterDrought tolerant
🗺Zones4–9
📏Height12-30 inches
Whorled Milkweed📷 Wikimedia Commons

When to Plant Whorled Milkweed

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 —
Zone 9 — February – April —

Companion Plants for Whorled Milkweed

✓ Good companions

Black-eyed Susan

Attracts predatory insects that control milkweed pests, similar growing conditions

Butterfly Weed

Another milkweed species that supports monarch reproduction and migration

Goldenrod

Attracts beneficial predatory insects and provides late-season monarch nectar

Little Bluestem

Provides structural support and habitat diversity without competing for nutrients

New England Aster

Provides late-season nectar for monarchs during fall migration

Purple Coneflower

Attracts beneficial insects and pollinators, extends bloom season for monarch butterflies

Wild Bergamot

Attracts native bees and butterflies, complementary blooming periods

Wild Lupine

Fixes nitrogen in soil, benefits milkweed growth without direct competition

✗ Keep away from

Crown Vetch

Aggressive spreader that can outcompete and smother native milkweed plants

Kentucky Bluegrass

Dense root system competes heavily for water and nutrients

Tree of Heaven

Releases allelopathic chemicals that inhibit milkweed germination and growth

Notes from the garden

A greener inbox, occasionally.

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