Growing A. incarnata (Swamp milkweed)

  • Creator
  • #61215


    Often get asked about this seed so here’s some helpful info.

    From Select Seeds:

    The round, flat flower heads of this deep pink native flower are deliciously scented of vanilla. Their smooth, lance-shaped leaves turn glorious colors in fall and their gracefully shaped golden seedpods are a crafter’s dream, and are filled with silky seeds that catch the breeze and paraglide away! Poisonous

    Lifecycle: Perennial
    Zone: 3,4,5,6,7,8,9
    Size: 4-5′ h x 2-3′ w
    Sun: Full sun to partial shade
    Soil: Rich, moist, well-drained
    Season: Summer
    Seed to Bloom:
    Color: Umbels of fragrant pink flowers

    Sow seeds directly in fall or spring
    Start seeds indoors 2 months before final frost- cold stratification required
    Winter sow for a natural cold stratification
    Divide plants in late spring

    Growing Swamp Milkweed
    Swamp milkweed is easy to grow from seed. To grow your own swamp milkweed, plant seeds in a pot outdoors in the fall, winter or early spring. The wet, cold conditions mimic wild seed propagation in nature and the seeds will germinate in mid spring.

    Swamp Milkweed sunlight requirements
    Swamp Milkweed prefers full sun (6+ hours per day) to partial shade (4-6 hrs per day). The more sun available the taller and more blooms will be produced.

    Soil / Moisture conditions for Swamp Milkweed
    Swamp Milkweed prefers moist to medium soil, and can tolerate occasional flooding. It grows well in clay, loam, or silt. Swamp Milkweed should not be grown in excessively sandy soil, without significant organic matter, as it will be too prone to drought.

    Swamp Milkweed is relatively easy to start from seed. The seeds need to be winter sown or experience a 30 day cold moist stratification period. Subjecting Swamp Milkweed seed to cold stratification has been shown to greatly increase the germination rate.

    Process to Grow Swamp Milkweed from seed
    Fill a pot, or winter-sowing container with moist potting mix
    Plant 3-5 Swamp Milkweed Seeds
    Cover with a dusting of potting soil
    Place container in a location that will receive morning sun and afternoon shade
    Germination will occur once daytime temperatures get above 70F

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