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Growing Inspiration
Inspiration for future Agardeni growing environments.
ornamentalFamily: ApocynaceaeGenus: AsclepiasSpecies: perennis
Cultivar
White Swamp Milkweed
Asclepias perennis
White Swamp Milkweed is a charming, clump-forming native perennial that thrives in areas with consistent soil moisture. It produces clusters of small, star-shaped white flowers with subtle pink or purple tints, attracting a wide variety of pollinators throughout the growing season. Unlike many other milkweeds, it is highly tolerant of wet soils, making it an excellent choice for rain gardens or near water features.
Asclepias perennis, or White Swamp Milkweed, is a resilient, moisture-loving native perennial valued for its delicate white blooms and role as a host plant for monarch butterflies.
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18-plant pack · Ship
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$67.59 total
2376 plants available · max 132 packs
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Cultivar Story
Start with Inspiration. Grow Your Aspiration.
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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
Grow your aspirational plan into an inspirational 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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Start · Plan · Grow
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Plant Profile
Grow White 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 to partial shade.
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Water
High moisture requirement; never allow the soil to completely dry out.
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Mature size
1-2 feet tall and 1-1.5 feet wide.
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Hardiness
6-9
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Growth habit
Clumping herbaceous 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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View Plant Data
Care, size, flowering, climate, soil, health, and additional reviewed data.
Good to know
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Growing note
Unlike upland milkweeds, this species requires constant moisture and can even survive brief periods of shallow standing water.
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Climate note
Thrives in warm summer climates; appreciates consistent humidity.
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Flower / fruit
Blooms from late spring through summer; produces slender, spindle-shaped seed pods typical of the Asclepias genus.
Growing & Care
Everyday care, growth, feeding, and pruning guidance.
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Growing & Care
Everyday care, growth, feeding, and pruning guidance.
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Sun / light
Full sun to partial shade.
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Growth rate
Moderate.
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Fertilizer
Generally requires little to no supplemental fertilizer in nutrient-rich organic soil.
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Pruning
Cut back dead foliage in late winter or early spring before new growth appears.
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Care notes
Unlike upland milkweeds, this species requires constant moisture and can even survive brief periods of shallow standing water.
Size & Habit
How the plant grows and the space it needs at maturity.
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Size & Habit
How the plant grows and the space it needs at maturity.
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Mature size
1-2 feet tall and 1-1.5 feet wide.
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Growth habit
Clumping herbaceous perennial.
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Spacing
12-18 inches apart.
Flower / Fruit
Flowering, fruiting, pollination, bloom, and harvest behavior.
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Flower / Fruit
Flowering, fruiting, pollination, bloom, and harvest behavior.
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Flowering / fruiting
Blooms from late spring through summer; produces slender, spindle-shaped seed pods typical of the Asclepias genus.
Climate & Hardiness
Cold, heat, chill, and regional growing considerations.
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Climate & Hardiness
Cold, heat, chill, and regional growing considerations.
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Hardiness zones
6-9
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Temperature
Thrives in warm summer climates; appreciates consistent humidity.
Soil & Water
Moisture, drainage, soil, and pH preferences.
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Soil & Water
Moisture, drainage, soil, and pH preferences.
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Watering
High moisture requirement; never allow the soil to completely dry out.
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Soil
Rich, moist to wet soil with high organic matter content.
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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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More Plant Data
19 additional reviewed fields from this Plant.id.
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Container Growing
Suitable for container growing if kept consistently moist; use a large pot with no drainage holes or a self-watering planter to maintain moisture levels.
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Family
Apocynaceae
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Foliage Look
Lush, lanceolate, medium-green foliage.
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Foliage Rules
Leaves are simple, opposite, and narrow, with smooth margins.
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Fruit Flower Look
Clusters of tiny, delicate white, star-shaped flowers with curved petals.
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Fruit Flower Rules
Flowers should appear in terminal umbels; only show seed pods on mature, established plants.
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Growth Habit Rules
Maintain a neat, clumping, upright form; avoid sprawling or vine-like depictions.
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Mature Plant Look
Compact, upright, leafy clump topped with dense white flower clusters.
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Mature Stage Morphology
Upright, multi-stemmed plant with narrow, opposite leaves and terminal clusters of white, star-shaped flowers.
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Morphology Rules
Ensure the plant appears as a clump of stems rather than a single woody trunk.
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Plant Faqs
Does White Swamp Milkweed need a lot of water? Yes, it thrives in consistently moist to wet soil conditions. Is it good for monarchs? Yes, like all milkweeds, it is an essential host plant for monarch butterfly caterpillars. How large does it get? It typically reaches 1 to 2 feet in height, making it a great compact choice for smaller gardens. Can I grow it in a pot? Yes, provided you keep the soil consistently moist by using a self-watering container or frequent watering.
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Root Look
Fibrous, healthy white root system.
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Soil Look
Dark, damp, organic-rich soil.
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Starter Stage
Small, tender green shoots in a plug tray with emerging true leaves.
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Starter Stage Morphology
Opposite lanceolate leaves, soft green stems, and healthy, well-developed white root mass within the plug cell.
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Video Voiceover Script
Welcome to Agardeni, where inspiration for gardening helps us imagine how and where we will grow White Swamp Milkweed. This is White Swamp Milkweed, available as 18, 36, and 72 plant starter trays through the Agardeni Marketplace. Let White Swamp Milkweed become part of your aspirational plan, helping you imagine the future pollinator-friendly landscape you want to create. This resilient native species is defined by its clusters of delicate, star-shaped white flowers that attract a diverse range of pollinators throughout the summer months. Establish your starter by moving the plug into a 4-inch pot with well-draining, moisture-rich soil, then move it to a permanent moist garden location. Find your inspiration with Agardeni. Explore real plants and real availability. Start. Plan. Grow.
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Youtube Tags
Asclepias perennis White Swamp Milkweed Native Plants Pollinator Garden Monarch Butterfly Moisture Loving Plants Perennial Gardening Agardeni
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Youtube Video Summary
Discover the beauty and ecological importance of Asclepias perennis, also known as White Swamp Milkweed. This moisture-loving native perennial is a must-have for supporting pollinators in damp garden spaces.
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Youtube Video Title
Growing Asclepias perennis: White Swamp Milkweed Guide
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