Asclepias incarnata Seeds

Swamp Milkweed Seeds

  • Pink Asclepias incarnata Seeds, Asclepias incarnata, Swamp Milkweed Seeds


Asclepias incarnata (Swamp Milkweed) is a wildflower with very beautiful clusters of pink flowers in summer and is a favorite larval food for Monarch butterflies.

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per packet
Zones 3 - 8
Deer Resistant
Deer Resistant
Attract Butterflies
Attract Butterflies
Attract Hummingbirds
Attract Hummingbirds
Bee Friendly
Bee Friendly
Light Requirements
Full Sun
Full Sun
Half Sun / Half Shade
Half Sun / Half Shade
Bloom Time Summer
Shipping Most orders ship within 5 business days. Learn More…
Size Packet


Asclepias incarnata (Swamp Milkweed) is a wildflower with very beautiful clusters of pink flowers in summer and is a favorite larval food for Monarch butterflies. It grows in medium to moist soil conditions (it doesn't need a swamp) and many types of soil including clay. A great species for rain gardens. USDA zones 3-8.
Common Name Swamp Milkweed Seeds
Botanical Name Asclepias incarnata
Seed Life Cycle Perennials
Light Requirements Full Sun, Half Sun / Half Shade
Flower Color Pink
Mature Height 36-48" tall
Bloom Time Summer
Ships As Seed
Seeds Per Pound 76,800
Seeds Per Packet 45
Days to Germination Cold Stratification - 30 days
Soil Moisture Average, Moist/Wet
Soil Type Clay Soil, Sandy Soil, Loamy Soil, Moist/Wet Soil
Native To North America
Native To North America
Native Yes
Ideal Region Northeast, Southeast, Midwest, Southwest, West, Pacific Northwest
Zones 3, 4, 5, 6, 7, 8
Advantages Deer Resistant, Attract Butterflies, Attract Hummingbirds, Bee Friendly
Storable Yes- You can store your seed in any cool (not freezing) dry place that is not subject to extreme temperature variations.
Non-GMO Yes
Neonicotinoid-Free Yes - Learn More
Ships to Hawaii, Alaska & Canada Yes

Planting Guides

Step-by-Step Asclepias (Milkweed) Seed Planting Instructions

  1. Asclepias (Milkweed) seeds have built-in dormancy mechanisms to protect the seedlings from frost and drought and will germinate after a 30 day stratification period. In fall: Planting after frost will provide necessary cold stratification. In spring: For best results, mix seeds with equal amounts of damp sand and place the mixture in a sealed plastic bag. Store in a refrigerator for 30 days before planting.
  2. Check for your last frost date and plant after this has passed. Choose a spot on your property that gets 6 or more hours of direct sun a day unless you are planting seeds for shade.
  3. Prepare your soil by clearing the area of all existing growth. Simply dig up everything that is growing, turn the soil and rake the area flat. If this is an area that has never before been gardened, you may need to till the area up to remove growth.
  4. Mix the seeds with sand* for better visibility and scatter the seeds directly on top of the soil. If you are sowing a larger area, we recommend using a seed spreader; if not, you can sow by hand.
  5. We recommend lightly compressing the seeds into the soil, making sure not to bury them. You can either walk on them, use a board or if you are sowing a larger area, rent a seed roller.
  6. Water so that the soil is moist, not soaking wet, until the seedlings are about 4-6" tall. After that, the seedlings will survive on natural rains. If you are experiencing very dry weather, we recommend watering occasionally.
Get more information on Planting Wildflowers
View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.


Most orders ship within 5 business days.

As soon as your order is placed you will receive a confirmation email. You will receive a second email the day your order ships telling you how it has been sent. Orders for in-season products ship within 5 business days. Depending upon your order date, we may hold your shipment to combine it with other products on your order, if applicable.

See our Shipping Information page for more detailed information. If you need express shipping or have any questions, please call Customer Service toll-free at (877) 270-5187 or Contact Us by email.

Reviewsby PowerReviews


by PowerReviews
High Country GardensAsclepias incarnata Seeds

(based on 2 reviews)

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(3 of 3 customers found this review helpful)


Wish They Germinated and Grew more Easily


from Sheridan, WY

About Me Avid Gardener

Verified Reviewer


  • Accurate Instructions


  • Low Germination Rate

Best Uses

  • Garden

Comments about High Country Gardens Asclepias incarnata Seeds:

I just can't get these guys started but I'll keep trying. Eventually I'll find the perfect way to get more of them to germinate and survive transplanting in the flower bed.

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(1 of 1 customers found this review helpful)


All duds - not one geminated!


from Chester, NY

Verified Reviewer

Comments about High Country Gardens Asclepias incarnata Seeds:

All duds - not one seed geminated!

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  • Personal

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Q & A

USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

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