ornamentalFamily: ApocynaceaeGenus: AsclepiasSpecies: incarnata

Cultivar

Swamp Milkweed

Asclepias incarnata

Swamp Milkweed is an upright, clump-forming native perennial that thrives in wet to moist garden settings. It produces clusters of fragrant, rose-pink flowers in summer that attract a variety of pollinators. This plant is essential for butterfly gardens, specifically serving as a larval host plant for monarch caterpillars.

Asclepias incarnata, or Swamp Milkweed, is a beautiful, moisture-loving native perennial prized for its fragrant pink blossoms and role as a vital host plant for monarch butterflies.

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18-plant pack · Ship

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$67.59 total

2160 plants available · max 120 packs

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Cultivar Story

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Growing Inspiration

Inspiration for future Agardeni growing environments.

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Marketplace Plant

A realistic representation of the starter plants offered in 18, 36, and 72 plant quantities.

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Aspirational Garden

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Plant Detail

A closer look at the fruit, flower, foliage, or mature defining characteristics of this cultivar.

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Repotting / Start Growing

Begin with a starter plant and establish it in a larger pot using quality potting soil with beneficials and fertilizer.

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Plant Profile

Grow Swamp Milkweed with confidence

Key growing information first, with the complete reviewed cultivar profile available when you want it.

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Sun

Full sun

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Water

Prefers consistently moist soil; avoid allowing the soil to dry out completely, especially during the first growing season.

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Mature size

3-4 feet tall and 2-3 feet wide

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Hardiness

3-9

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Growth habit

Upright, clumping perennial

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Plant type

Perennial

View Plant Data

Care, size, flowering, climate, soil, health, and additional reviewed data.

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Good to know

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Growing note

Unlike other milkweeds, this species prefers consistent moisture and tolerates heavier, damp soils quite well.

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Climate note

Very cold hardy; thrives in summer heat provided moisture is adequate.

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Flower / fruit

Produces clusters of fragrant, rose-pink flowers in mid-to-late summer, followed by ornamental, narrow seed pods.

Growing & Care

Everyday care, growth, feeding, and pruning guidance.

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Sun / light

Full sun

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Growth rate

Moderate

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Fertilizer

Generally does not require heavy feeding; a light application of balanced, organic fertilizer in spring is sufficient.

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Pruning

Cut back dead stems to the ground in late winter or early spring before new growth appears.

Care notes

Unlike other milkweeds, this species prefers consistent moisture and tolerates heavier, damp soils quite well.

Size & Habit

How the plant grows and the space it needs at maturity.

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Mature size

3-4 feet tall and 2-3 feet wide

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Growth habit

Upright, clumping perennial

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Spacing

18-24 inches

Flower / Fruit

Flowering, fruiting, pollination, bloom, and harvest behavior.

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Flowering / fruiting

Produces clusters of fragrant, rose-pink flowers in mid-to-late summer, followed by ornamental, narrow seed pods.

Climate & Hardiness

Cold, heat, chill, and regional growing considerations.

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Hardiness zones

3-9

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Temperature

Very cold hardy; thrives in summer heat provided moisture is adequate.

Soil & Water

Moisture, drainage, soil, and pH preferences.

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Watering

Prefers consistently moist soil; avoid allowing the soil to dry out completely, especially during the first growing season.

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Soil

Rich, loamy, or clay-based soils that retain moisture.

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Soil pH

6.0-7.5

More Plant Data

19 additional reviewed fields from this Plant.id.

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Container Growing

Suitable for large containers provided they are kept well-watered; ensure the soil mix is moisture-retentive.

Family

Apocynaceae

Foliage Look

Smooth, lance-shaped, bright to medium green foliage with an opposite arrangement.

Foliage Rules

Leaves must be lanceolate, pointed, and arranged in an opposite, decussate pattern along the stem.

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Fruit Flower Look

Dense, rounded clusters of small, fragrant, star-like pink flowers followed by upright, thin seed pods.

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Fruit Flower Rules

Flowers are small, five-petaled, and form dense, rounded umbels; seed pods are long, spindle-shaped, and usually appear after flowering in late summer.

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Growth Habit Rules

Should appear as an upright, non-spreading clump; do not depict as a creeping groundcover or a woody shrub.

Mature Plant Look

A stately, upright, clumping perennial topped with clusters of rose-pink, nectar-rich flowers.

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Mature Stage Morphology

Features tall, sturdy stems with opposite, smooth-margined, willow-like leaves and large, terminal umbels of small pink flowers.

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Morphology Rules

Ensure the plant appears as a clean, upright herbaceous perennial; roots should be fibrous but compact in a starter state.

Plant Faqs

How much water does Swamp Milkweed need? Keep the soil consistently moist as it naturally thrives in wet areas. Will this plant attract butterflies? Yes, it is a primary host plant for monarch butterflies and a nectar source for many pollinators. Can I grow this in a pot? Yes, use a large, moisture-retentive container and ensure it never fully dries out. How tall does it get at maturity? It typically grows between 3 to 4 feet tall.

Root Look

Clean, light-colored fibrous roots within a firm, damp plug.

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Soil Look

Dark, moist, organic-rich potting medium.

Starter Stage

Small, upright herbaceous stems with opposite, lance-shaped leaves, developing from a compact root system.

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Starter Stage Morphology

Young plants have a distinct, clean, upright form with bright green foliage, showing no signs of flowers until the second season.

Video Voiceover Script

Welcome to Agardeni, where inspiration for gardening helps us imagine how and where we will grow Swamp Milkweed. This is Swamp Milkweed, available as 18, 36, and 72 plant starter trays through the Agardeni Marketplace. Let Swamp Milkweed become part of your aspirational plan, helping you imagine the future growing space you want to create. This native perennial features elegant, fragrant pink flower clusters that provide a critical nectar source and host environment for monarchs. Establish your starter plug in a four inch pot with well-draining soil, then move it to a moist, sunny garden spot when established. Find your inspiration with Agardeni. Explore real plants and real availability. Start. Plan. Grow.

Youtube Tags

Asclepias incarnata Swamp Milkweed Agardeni native plants pollinator garden monarch butterfly perennial flowers butterfly host plant moisture loving plants gardening

Youtube Video Summary

Swamp Milkweed is a vital native perennial known for its fragrant, pink summer blooms and essential support for monarch butterfly populations. It thrives in moist soil, making it a perfect, low-maintenance addition to any garden landscape.

Youtube Video Title

Growing Swamp Milkweed Asclepias incarnata

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