Toxic Plant Known to be toxic - Toxic to mammals if ingested.
Image of Asclepias exaltata
Source: Margaret Unger

Plant Names

image of Flowering plant
Asclepias exaltata
Poke Milkweed
Asclépiade très grande

Synonyms

tall milkweed
grande asclépiade

Plant Characteristics

Bloom Colour: White Bloom Period: Jun - Jul
Max Height: 5.0 feet
Max Width: 3.0 feet (spreads by rhizome)
Light Condition:
Full shade Less than 2 or 3 hours of direct sun a day
Soil conditions:
Moisture medium Tolerates medium soil condition
Lifespan: Perennial plants that will come back year after year
Gardener Experience:
does not spread Does not spread uncontrollably
plant spread by rhizome Spreads by rhizome
plant stratification Requires stratification
Landscape Uses:
container suitable Suitable for container garden
woodland garden Suitable for woodland gardens
boulevard garden tolerant Tolerates boulevard garden conditions
Ecological Benefits:
Pollinator garden Supports pollinators
butterfly host Butterfly host
Tolerates:
Deer Resistant Deer resistant
Rabbit Resistant Rabbit resistant
Limestone Tolerant Tolerates limestone conditions
Transplantation Tolerant Tolerates transplantation
Special Features and Considerations:

Seed and plant distribution status

No seeds available for this plant.

We are not accepting seeds for this plant at the moment.

Fun Facts

Asclepias exaltata, commonly called poke milkweed, is a native perennial found in open woodlands and forest edges across eastern North America. Unlike many milkweeds that prefer full sun, this species grows well in part shade, making it a good choice for lightly shaded gardens.

It prefers moist to medium, well-drained soil and produces drooping clusters of soft pink to white flowers in early to mid-summer. Like other milkweeds, it is an important host plant for monarch caterpillars and supports a variety of pollinators. By late summer, slender seed pods form, releasing silky-tufted seeds that disperse by wind.

Plant Location

Distribution according to VASCAN

Distribution: Asclepias exaltata
Ephemeral Native Introduced Excluded Extirpated Doubtful Absent

Thrives in Ecozones

  • Boreal Shield
  • Mixed Wood Plains

Ecological Benefits

Butterflies Supported by Asclepias exaltata

Specialized Bees Supported by Asclepias exaltata

No bee data available for this plant.

Complementary Plants

  • No complementary plants found.

Substitute For Non-Native Plants

  • Hydrangea (Hydrangea)
  • Asclepias (Milkweed Cultivars)
  • Asclepias curassavica (Tropical Milkweed)

Sowing Information

Download Seed Envelope Labels (PDF)
  • Sowing depth: Sow just below surface
  • Sow by March
  • Stratification duration: 30 days

Harvesting and Seed Sharing

  • Harvest start month: September
  • Harvesting indicator:
    • Pods are slightly open and seeds inside are dark
  • Harvesting:
    • Use hand to detach from main stem
  • Seed viability test:
    • No test needed before donating
  • Packaging measure: 1 rounded 1/8 teaspoon
  • Seed storage:
    • Air dry in paper bag or open container, for a few days until crisp
    • Shake seeds to move them once in a while to prevent molding
  • Cultivar: No, you can donate without knowing the source as there are only straight species
  • Remove non-seed material
  • No harvesting video available at this time.

Toxicity Notes

Toxic to mammals if ingested.