Swamp Milkweed Seeds

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Swamp Milkweed is a red, showier variety of Common Milkweed. It is extremely elegant, producing willowy foliage and cherry-red blooms. It will also attract beautiful butterflies and hummingbirds to your garden or meadow. Perennial.

Zones 3 - 8
Advantages
Deer Resistant
Deer Resistant
Hummingbirds & Butterflies
Hummingbirds & Butterflies
Native
Native
Light Requirements
Full Sun
Full Sun
Half Sun / Half Shade
Half Sun / Half Shade
Mature Plant Size 36-48 inches tall
Bloom Time Summer
SKU ASIG
Everybody knows "Common Milkweed," the tough leathery plant with the dusty lavender blooms that are favored by Monarch butterflies. Swamp Milkweed is close to this variety, but much more elegant. The leaves are less coarse, and the plant is usually sort of willowy and tall. Best of all, the blooms are cherry-red and also welcome monarchs and hummingbirds. As you can tell by the name, this wildflower prefers wet ground, but in full sun.
Associated SKUs
ASIG
ASIP (Packet)
ASIQP (1/4 Pound)
Common Name Swamp Milkweed
Botanical Name Asclepias incarnata
Seed Life Cycle Perennials
Light Requirements Full Sun, Half Sun / Half Shade
Flower Color Pink
Mature Height 36-48 inches tall
Bloom Time Summer
Ships As Seed
Seeds Per Pound 76,800
Seeds Per Packet 45
Soil Moisture Average, Moist/Wet
Soil Type Clay Soil, Sandy Soil, Loamy Soil, Moist/Wet Soil
Native To North America
Native To Most of the United States except West Coast
Native Yes
Ideal Region Northeast, Southeast, Midwest, Southwest, West, Pacific Northwest
Zones 3, 4, 5, 6, 7, 8
Advantages Deer Resistant, Hummingbirds & Butterflies, Native
Is It 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

How to Germinate and Grow Milkweed Seed

Instructions for preparing and planting Common Milkweed Seed (Asclepias Syriaca) and Swamp Milkweed (Asclepias Incarnata) from seed.

Let’s Get Started: Understanding Milkweed Seed & Germinating

Step 1: To start Milkweed seed we recommend starting inside, but before this happens Milkweed seeds need to go through a cold stratification period. Cold stratification is very important for the germination and growth of Milkweed. It helps break the seeds natural dormancy cycle. To do this, we recommend placing Milkweed seed in a damp paper towel or damp sand in a zip lock bag and place in your fridge for 3 – 6 weeks (30 days). Place in an area of the fridge, where it won’t get damaged. We taped ours to the bottom of a refrigerator shelf.

Growing Indoors

Step 2: Planting - Once the 30 days are complete, it’s time to plant the cold stratified Milkweed seeds. We recommend planting in 2-4” peat pots. Fill peat pots ¾ of the way with potting soil and gently add water. Water should be able to drain through the peat pots. Once the soil is damp, place 1-2 cold stratified seeds into each pot. To finish, place ¼ inch of soil on top of the seed.

Watering - Gently water the planted seed to give additional hydration. The best way to water is from the bottom up. Use a flat pan under the peat pots and add a half inch of water to the bottom of the tray. Don’t over water as it can cause fungus. Water every day or every other day as needed, the best way to test the soil dampness is to touch it. If the soil seems dry then add water; if it’s wet, wait for the soil to dry out to water.

Light Requirements - For the next few weeks, make sure the Milkweed is either in a sunny window, in a green house or under a grow light. Milkweed needs lots of sun and warmth to grow. If you’re using a grow light, make sure to lower the bulb closer to the pots or your seedlings may become leggy, as they stretch to the light. Ideally a sturdier stem is better. Cold stratified seeds should germinate and sprout within 10-15 days once planted. In total Milkweed from the day they are cold stratified to growth can take 40 plus days, so be patient!

Other planting options: Place dry seed (not stratified) in seed starting soil and plant in peat pots under a grow light or in a greenhouse to germinate seeds. The success rate for this is low and more difficult to accomplish. If you choose to use this option it can take months for the seeds to germinate.

If you are planting seed outside, we suggest seeding in late fall, and let the Milkweed seed lay on the ground through winter. Milkweed seed will have a long winter of dormancy, so once the sun comes out and the ground warms in the spring, the seeds will germinate on their own.

Transplanting Milkweed Seedling Outdoors

Step 3: Milkweed does well in open areas with full sunlight exposure areas like fields, parks, cultivated gardens, roadsides, highway medians, and road sides. We suggest transplanting Milkweed when the plant is no larger than 3 inches tall. In most cases in transplanting, the Milkweed plant will go though some shock and could lose all its leaves. This happens, don’t panic. The plant is trying to establish its roots and will eventually grow leaves again. This is the main reason we suggest planting seeds in peat pots, because Milkweed roots are very sensitive. Peat pots breakdown over time in the ground, which allows the milkweed roots to grows without being disrupted. We found this to be the best way to transplant. If you decide to plant in plastic containers, make sure it’s deep enough for roots to grow. If you receive a plant already grown in plastic, be careful to take out the plant and not disturb the roots.

When to Plant Milkweed

Soil moisture and temperature are very important when growing Milkweed. The best time to plant Milkweed is in early spring after the danger of frost has passed. If you plant seeds late in the spring, the seeds may not grow due to germination time and temperature. Common Milkweed seed doesn’t germinate over 85 degrees.

Caring for Milkweed Plants

Once your seedling is planted, water it for a few days to get it established, but after that, the plant doesn’t need a lot of supplemental water. Only water if you have an unusual dry spell. Peat pots are nice to use, but you need to be sure there is no top edge above the soil line after transplanting. In dry climates, this will wick away valuable soil moisture. A small 2 1/2" diameter x 3 in. deep pot is ideal. Asclepias are somewhat finicky native plants. So minimizing the time growing in a pot and transplanting them as young plants is the best approach

Most orders ship within 48 hours or less.

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 48 hours or less. 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 approximate ship dates and more detailed information. If you need express shipping or have any questions, please call Customer Service toll-free at (877) 309-7333 or contact us by email.

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REVIEW SNAPSHOT®

by PowerReviews
Swamp Milkweed Seeds
 
3.2

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (3)

  • 4 Stars

     

    (3)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (3)

67%

of respondents would recommend this to a friend.

Pros

No Pros

Cons

No Cons

Best Uses

  • Garden (3)
    • Was this a gift?:
    • No (5)

Most Liked Positive Review

 

AMAZING!

purchased 3 plants from AM, two came up, called they were out of it, but will send more in the spring! great company, great plant, if you love butterflies, this is...Read complete review

purchased 3 plants from AM, two came up, called they were out of it, but will send more in the spring! great company, great plant, if you love butterflies, this is the plant for you...keep it watered! and it will do fine.. I have it in my butterfly garden, and it's healthy and has had over 50 monarch caterpillars on it this year.. this is my first year with it.. mine was white, very pretty!

VS

Most Liked Negative Review

 

Not as good as I expected

I plante 20 of my 45 seeds. Only eight sprouted and grew . They were very slow to sprout. After sprouting they grew pretty fast. mudch beeter than the Common Milkweeds I planted....Read complete review

I plante 20 of my 45 seeds. Only eight sprouted and grew . They were very slow to sprout. After sprouting they grew pretty fast. mudch beeter than the Common Milkweeds I planted. After all danger of frost I planted them. They have grown very well, and I am satisfied with the plants I have. They did not bloom this year. They had 5 Monarch larva, that grew almost to two inches , but some kind of predator got them, so no Monarchs .
I still have 25 seeds , and I will try them in the spring.

Reviewed by 10 customers

Displaying reviews 1-10

Back to top

 
5.0

So far so good!

By 

from Virginia

About Me Getting Started

Pros

  • Accurate Instructions

Cons

  • Difficult To Use

Best Uses

  • Garden
  • Patio

Comments about Swamp Milkweed Seeds:

I started the seeds indoors, more than half sprouted, which from what I understand, is a good percentage for Milk Weed. The roots of this plant are very delicate and do not respond well to transplantation, so I kept them in Jiffy pots. When it was time to put them outside, I just tore off the bottom of the pot and buried the whole thing in a sunny spot.

They are not flowering yet, but I expect this plant to do well.

  • Primary use:
  • Personal
 
1.0

Disappointed

By 

from Bayville NJ

Pros

    Cons

      Best Uses

      • Garden

      Comments about Swamp Milkweed Seeds:

      Last year I planted directly outside, did not germinate. This year is rated inside in spring in 48 seed pods, planted as directed, only four germinated but did not survive outse. Desperate to grow milkweed for Monarchs, but have been disappointed in the results.

      (1 of 1 customers found this review helpful)

       
      5.0

      Easiest milkweed to grow

      By 

      from Virginia

      About Me Avid Gardener

      Verified Reviewer

      Pros

      • Hardy
      • Healthy

      Cons

        Best Uses

        • Butterfly garden
        • Garden
        • Outdoors

        Comments about Swamp Milkweed Seeds:

        During winter 2014/2015 I sowed three different types of milkweed- Common, Swamp, and Butterflyweed. The Swamp Milkweed is far and away the easiest to get to germinate and transplant. With cold stratification I had good germination rates and the resulting seedlings have been potted up. It will soon be time for them to go into the garden. Very happy with these seeds.

        • Primary use:
        • Personal

        (0 of 1 customers found this review helpful)

         
        4.0

        Awesome...Love these plants

        By 

        from Spring Valley, WI

        Verified Reviewer

        Pros

        • Attracts Butterflies
        • Easy to Grow

        Cons

          Best Uses

          • Naturalizing

          Comments about Swamp Milkweed Seeds:

          Attracts butterflies. Beatutiful.

          • Was this a gift?:
          • No

          (3 of 3 customers found this review helpful)

           
          1.0

          Swamp Milkweed Seeds -

          By 

          from Russellville, Arkansas

          Verified Reviewer

          Comments about Swamp Milkweed Seeds:

          I ordered three packets of seed and received them quickly. I planted 2 packets of twenty milkweed seeds per packet and and only 2 seeds came up. Of those two, only one survived planting in the garden. I was very disappointed.

          • Was this a gift?:
          • No

          (10 of 11 customers found this review helpful)

           
          4.0

          milkweed germination

          By 

          from Maryland

          Verified Reviewer

          Comments about Swamp Milkweed Seeds:

          Most milkweed seeds need a period of cold to break their dormancy. Spring planted milkweed seeds will have a very low germination rate. To overcome this, scarify the seeds, i.e. put them in a plastic bag in damp (not wet) sand and keep them in the refrigerator (not freezer) for 6 weeks. Then plant outside or in pots. Tropical milkweeds do not need this.

          • Was this a gift?:
          • No

          (2 of 2 customers found this review helpful)

           
          2.0

          Not as good as I expected

          By 

          from Sharpsburg , Md.

          Verified Reviewer

          Comments about Swamp Milkweed Seeds:

          I plante 20 of my 45 seeds. Only eight sprouted and grew . They were very slow to sprout. After sprouting they grew pretty fast. mudch beeter than the Common Milkweeds I planted. After all danger of frost I planted them. They have grown very well, and I am satisfied with the plants I have. They did not bloom this year. They had 5 Monarch larva, that grew almost to two inches , but some kind of predator got them, so no Monarchs .
          I still have 25 seeds , and I will try them in the spring.

          • Was this a gift?:
          • No
           
          1.0

          did not grow

          By 

          from joliet il

          Verified Reviewer

          Comments about Swamp Milkweed Seeds:

          I planted the seeds and they never started up

          • Was this a gift?:
          • No

          (9 of 9 customers found this review helpful)

           
          5.0

          AMAZING!

          By 

          from west alexander, pa

          Pros

          • Fast growing
          • Gorgeous
          • Keep it watered
          • Monarchs all over it
          • Purhased roots not seeds

          Cons

          • Two of three came up

          Best Uses

          • Raising monarchs

          Comments about Swamp Milkweed Seeds:

          purchased 3 plants from AM, two came up, called they were out of it, but will send more in the spring! great company, great plant, if you love butterflies, this is the plant for you...keep it watered! and it will do fine.. I have it in my butterfly garden, and it's healthy and has had over 50 monarch caterpillars on it this year.. this is my first year with it.. mine was white, very pretty!

          (11 of 11 customers found this review helpful)

           
          4.0

          Monarch love this plant

          By 

          from Kankakee Cty IL

          Pros

          • Easy to Grow
          • Native plant
          • Weather tolerant

          Cons

            Best Uses

            • Raising the Monarch

            Comments about Swamp Milkweed Seeds:

            I have this planted around the house and in the prairie restoration. The older plant,4+ years, this year had 20 caterpillars on it at one time. Completely leafless when the migrating generation was done.

            Displaying reviews 1-10

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            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).

            Find Your Planting Zone:

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