Common milkweed (Asclepias syriaca)

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Common milkweed

Habit (mature) · Circeus / Wikimedia Commons · CC BY-SA 2.0 Canada

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Common milkweed

Asclepias syriaca

A native, colony-forming milkweed for sunny pollinator meadows, monarch habitat, and larger naturalized areas.

Native: 27 US states + 2 CA provinces

Review: Source-backed

Climate fit: broad (90/100)

Pollinator

Filler

Light

Full sun

Water

Low water

Mature size

36-60" tall · 24" apart

Hardy in zones

3a-9b

brutally 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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Transplanting and establishment

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Fertility and feeding

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A documented larval host for the Milkweed tussock moth and 1 other species — specialist wildlife that depend on plants like this to reproduce.

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 41 ecoregions — 40 climate-resilient through 2070 · 1 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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Atlantic coastal pine barrens

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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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Chilean Matorral

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Pollination

Self-fertile

Self-fertile in mechanism but requires specialized pollination by large insects. Asclepias pollen is packaged in pollinia (pollen sacs) that get hooked onto bumblebees, large solitary bees, monarch butterflies, and large wasps as they visit. Without these specific large pollinators, seed set is poor; planting in clusters and supporting native bee populations is the practical requirement.

Plants don't grow alone

Larval host

Specialist

Butterfly

Monarch butterfly (Danaus plexippus)

Larvae feed exclusively on milkweeds (Asclepias spp.); A. syriaca is one of the principal monarch host plants across eastern North America. The single most wedge-load-bearing wildlife relationship in the catalog.

Larval host

Specialist

Moth

Milkweed tussock moth (Euchaetes egle)

Tussock moth larvae often share milkweed plants with monarch caterpillars; both species depend on Asclepias.

Pollinates

Bee

American bumblebee (Bombus pensylvanicus)

Bumble bees are documented effective Asclepias pollinators (they carry the pollinia); Lanterman Novotny 2023 ranks Asclepias among preferred Bombus plants. Genus-level inference for B. pensylvanicus.

Pollinates

Bee

Common eastern bumblebee (Bombus impatiens)

Large bumblebees are among the few insects strong enough to work the pollinia-loaded flowers effectively.

Pollinates

Bee

Eastern carpenter bee (Xylocopa virginica)

Nectar forage

Butterfly

Painted lady (Vanessa cardui)

UW-Madison Horticulture names milkweed (Asclepias) among adult V. cardui nectar sources; common milkweed is the representative species.

Nectar forage

Butterfly

Eastern tiger swallowtail (Papilio glaucus)

For people

Edible with preparation

Young shoots (under about 8 inches), immature flower buds, and immature seed pods are all edible after boiling. The plant contains cardenolide cardiac glycosides that taste intensely bitter in mature tissues and were historically thought to require multiple changes of boiling water — modern foraging literature (Sam Thayer, The Forager Harvest, 2006) demonstrated that a single boil is sufficient for A. syriaca and the multi-change technique is unnecessary. Other Asclepias species are more toxic; A. syriaca is the canonical edible milkweed.

Edible parts

young-shoots, flower-buds, immature-seed-pods

Toxic parts

mature-leaves, mature-stems, sap

Culinary use

Young shoots prepared like asparagus; flower buds added to stir-fries and pasta; immature seed pods sliced and used like okra. Flavor is mild and slightly sweet.

Preparation required

Boil 1-3 minutes; drain and use. Despite older folk advice, A. syriaca does NOT require multiple changes of boiling water (Thayer, 2006). Eat only the named parts at the named stages: young shoots before they reach 8 inches, flower buds before the flowers open, and immature seed pods before the silk inside turns silky.

Lookalike warning

Young milkweed shoots can be mistaken for dogbane (Apocynum) shoots; dogbane is significantly more toxic and bitter. Distinguishing features: milkweed sap is sticky-white and the stems are usually round, while dogbane has more branched stems and reddish coloration at the base. When in doubt, do not harvest.

Foraging context

Wild populations are abundant across the eastern and central United States; the plant is the obligate host of the monarch butterfly, so harvest selectively — leave plenty for the monarchs.

Traditional medicinal use

Traditional use of milkweed root and latex by Indigenous peoples of eastern North America (Cherokee, Iroquois, Menominee, and others) for external wart and skin treatments; modern internal use of the latex is dangerous due to cardiac-glycoside content.

Appears in collections

+4

Collection · 8 plants

Climate-resilient natives for warming zones (eastern NA)

A pollinator-supporting palette of eastern NA natives whose USDA zone range and broad continental distribution score high on the climate-resilience composite. Every plant tolerates 6-7 USDA zones and is native across 15+ US states + multiple Canadian provinces. Holds up under the SSP3-7.0 mid-century projection without the gardener trading wildlife value for resilience.

Switchgrass

Little bluestem

Common milkweed

Black-eyed Susan

Wild bergamot

Sweet Joe-Pye weed

Cutleaf coneflower

New England aster

+5

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.

Butterfly weed

Common milkweed

Purple coneflower

Wild bergamot

Scarlet bee balm

Little bluestem

Sweet Joe-Pye weed

Swamp sunflower

Smooth blue aster

Sources & citations

Cite this page

For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.

Plotwright. (2026, May 17). Common milkweed (Asclepias syriaca). Retrieved 2026, June 5, from https://plotwright.garden/plants/common-milkweed

Sources for every fact

Every fact on this page traces to a source. 18 fields cited — 18 source-backed.

NC State Extension Gardener Plant Toolbox

University extension service

Backs 17 fields

Identity

Summary

Plant type

Light

Moisture

Hardiness

Heat zone

Size

Spacing

Habit

Design roles

Seasonal interest

Growth stages

Lifecycle

Regional guidance

Success tips

Designer notes

Wikimedia Commons

Photo · CC BY-SA 2.0 Canada

Backs 1 field

Image

Community photos

The photos above are our reviewed reference set, curated for accuracy.