Butterfly Weed Seed Collecting

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Asclepias tuberosa (Butterfly Weed) milkweed has attractive, bright orange flowers in late spring and is a nectar source for bees and butterflies. How to Plant Butterfly Weed Seeds. Sometimes called pleurisy root, butterfly weed (Asclepias tuberosa) is a perennial wildflower grown for its showy, reddish-orange flower clusters and textured, lanceolate leaves. It thrives throughout U.S. Department of Agriculture plant hardiness zones 4 to 10, where it is … Collect butterfly weed seeds from the garden is fun and easy. Follow these steps to learn how to harvest butterfly weed seeds for planting next year.

Butterfly Weed Seeds (Asclepias)

Asclepias tuberosa (Butterfly Weed) milkweed has attractive, bright orange flowers in late spring and is a favorite nectar source for bees and butterflies.

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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Asclepias (Milkweed) are sun loving plants that are essential perennials for monarch butterflies providing food for caterpillars and nectar for adult butterflies. They bloom from mid-summer into early fall and, with their milky sap, are resistant to rabbits and deer.

Asclepias can be divided into two groups for plant care; Asclepias tuberosa with orange (sometimes yellow) flowers and all the other species with pink (sometimes white) flowers.

Planting Milkweed Seeds:

Milkweed (Asclepias) seeds germinate best under warm soil conditions. The seeds need a cold, dormant period, known as stratification, to germinate.

They can be successfully seeded outdoors in fall in areas that received frost, for spring germination. For mid to late spring planting, all species (A. tuberosa, A. syriaca, A. sullivantii, A. incarnata) will also germinate moderately well when seeded into warm ground after being stratified (chilled).

Dry stratification is done by placing dry seed in the refrigerator for 30 or more days. A more effective strategy is to moist stratify them by mixing seed with moist (not soggy) sand in a zip-lock plastic bag and place them in the refrigerator for 30 days. After 30 days of cold moist storage, the seed’s natural chemical germination inhibitors have dissipated and are ready to sprout.

    Asclepias tuberosa (Orange Butterfly Weed) – this perennial stays dormant until later in the spring than many other plants, especially when grown in pots. It’s fine to plant dormant plants; don’t up-pot them for planting later in the growing season.

Preferred growing conditions:

  1. Need sandy or gravelly soils (except the Clay form which does well in heavier soils including dry clay.)
  2. Does best with gravel mulches.
  3. After their second growing season, only requires deep but infrequent watering. Plant in full hot sun.
  4. Just a few handfuls of compost and Yum Yum Mix added to the planting hole is enough. Don’t plant into a rich, highly-amended soil.

Special comments:

  • When planting dormant plants, water thoroughly after planting and wait to water again until the plant comes into active growth, at which time a deep watering every week or so is adequate. Take care not to overwater young transplants.
  • Asclepias has a long, carrot-like tap root that should remain undisturbed after planting and should NOT ever be divided.

Preferred growing conditions:

  1. These species grow in a wide range of soil types, including clay.
  2. They don’t need mulching (except in very hot climates).
  3. These are moisture-loving perennials and do well in wet to moderately moist soil conditions.
  4. Plant in full to part sun areas.
  5. They like compost enriched soils at planting time.

Special comments:

  • Asclepias syriaca and A. speciosa will spread to make big patches of plants and are best planted in parts of the landscape where they won’t crowd out less vigorous plants. Not recommended for the prime spots in your perennial beds.
  • Asclepias incarnata (Swamp Milkweed) is a more refined grower and is fine to include in perennial beds.

Oftentimes, Milkweeds won’t grow much their first season in the ground, so be patient. They are establishing their root system and crown. By the second growing season, the plants will begin to get bigger and look more robust. Asclepias species are an odd bunch and don’t behave like many other more familiar perennials. So be patient and accept their quirky nature.

Garden care:

  1. Fertilize Asclepias just once in fall with Yum Yum Mix and Planters II. – Naturalized plantings don’t need additional fertilization.
  2. To encourage re-seeding and provide winter interest with their ornamental seed pods, leave the stems intact over the winter. In mid-spring, remove old stems just above ground level.
  3. All species of Asclepias are late to emerge in the spring, so don’t be concerned if other perennials come up first and they remain dormant.

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How to Plant Butterfly Weed Seeds

Sometimes called pleurisy root, butterfly weed (Asclepias tuberosa) is a perennial wildflower grown for its showy, reddish-orange flower clusters and textured, lanceolate leaves. A member of the milkweed family, it thrives throughout U.S. Department of Agriculture plant hardiness zones 3 to 9, where it is frequently added to butterfly gardens and native plant landscaping.

Butterfly weed and milkweed seed pods may be harvested and planted to support Monarch butterfly caterpillars. Butterfly weed grows well from seeds, which must be harvested in late summer and either sown immediately in the garden, or started in spring after a lengthy chilling process. The seeds are viable and will germinate with little care, although they must be planted at the appropriate depth to ensure successful sprouting.

Gather the butterfly weed seeds in late summer or autumn, once the pods dry to a light, rosy-beige color, but before they split open. Put on rubber gloves before handling the pods to protect your hands from the mildly toxic sap.

Before you begin to harvest the butterfly weed pods, sterilize your cutting tools. Dip the blades into a full-strength household cleanser, such as Lysol or Pine-Sol. Repeat between cuts to prevent the spread of diseases.

Snip off the pod using pruning shears. Slice lengthwise along the edge using a utility knife. Pry open the seed pods. Scoop out the seeds and fluffy matter inside and place it in a bucket.

Leave the bucket outdoors for two or three days to let the fluff blow away. Stir the seeds occasionally to loosen more fluff. Do not worry if some of the fluff remains, since it won’t inhibit the germination process.

Place the butterfly weed seeds in a plastic bag filled with 1 cup of moistened perlite. Store the bag inside the refrigerator for three months. Mist the perlite with water every few days to keep it from drying out completely.

Prepare peat or other biodegradable pots before removing the butterfly weed seeds from the refrigerator. Fill 3-inch starter pots with a mixture of half seed-starting compost and half coarse sand. Moisten the mix and press it firm.

Make a 1/4-inch-deep planting hole in the center of compost mixture. Drop one butterfly weed seed in the planting hole. Cover it with a loose layer of compost. Mist the compost to settle it.

Arrange the starter pots on a propagation mat near a source of bright, indirect light such as near a partly shaded south-facing window. Set the temperature on the propagation mat to 86 F during the day. Turn it off at night.

Water the butterfly weed seeds whenever the compost feels barely damp when pressed. Apply the water by the spoonful or use a spray bottle to keep from dislodging the seeds.

Watch for germination in two to three weeks. Turn off the propagation mat one week after the seeds sprout. Move the pots into a cold frame outdoors or against a south-facing wall with noonday shade.

Transplant the butterfly weed into a permanent bed in spring just after the last frost. If planting butterfly weed in clay soil, dig in 2 to 4 inches of compost to lighten the soil, or consider building raised beds to increase drainage.

Spread a 1-inch-thick layer of mulch around each plant. Water weekly to a 2-inch depth during their first summer, then cease supplemental irrigation.

How To Harvest Butterfly Weed Seeds

Butterfly weed seeds are one of the easiest types of seeds to collect from the garden. In this post, I will show how to harvest butterfly weed seeds from your garden step-by-step, and also show you how to store them for next year.

Butterfly weed is one of my favorite plants that I have growing in my garden. Not only does it add amazing color to the garden, the butterflies flock to it. Plus, it’s a host plant for everyone’s favorite monarch butterfly.

Collecting butterfly weed seeds is easy, and doesn’t take much effort – you just need to get the timing right.

So below I’ll show you how to tell when butterfly weed seeds are ready to harvest, how to gather them, and what to do with them after you’re done collecting them.

Butterfly weed flower growing in my garden

Table of Contents

Harvesting Butterfly Weed Seeds

Butterfly weed is also one of the easiest seeds to collect from the garden. After the flowers fade on the plant, butterfly weed gets these gorgeous seed pods.

If you want to collect butterfly weed seeds from your garden, allow the seed pods to dry on the plant.

Butterfly weed seed pods

When To Harvest Butterfly Weed Seeds

When the seeds are ready to be harvested, butterfly weed seed pods will turn brown and start to break open on their own.

The seeds have puffs of cotton attached to them, which allows them to fly in the wind and seed themselves all around the neighborhood.

So, make sure you collect the seeds as soon as the pods start to break open, or they may disappear on you.

Butterfly weed seeds ready to harvest

What Do Butterfly Weed Seeds Look Like

Butterfly weed seeds are flat, brown and shaped like a tear drop – and there are a ton of seeds in each seed pod.

Like I mentioned above, they are attached to white cotton, which can make the task of harvesting butterfly weed seeds a bit more tedious.

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Butterfly weed seeds and chaff

How To Harvest Butterfly Weed Seeds Step-By-Step

Clip the seed pods off the plant and drop them into a container or bag. Don’t attempt to harvest butterfly weed seeds outside.

Otherwise every time the wind blows you’ll be chasing them down the street. Once you’ve collected the seed pods, bring them inside.

Collecting butterfly weed seed pods in a container

Like I said, it can be a bit tedious to harvest butterfly weed seeds, because of the fine fluffy stuff that’s attached to the seeds. So start by breaking open the seed pod.

Break open the seed pod to collect butterfly weed seeds

Then firmly grab the entire fuzzy clump and pull it out of the seed pod. Wait, don’t let go.

Gently pinch the seeds to tease them away from the fluffy stuff. It can be a messy job, so you might want to keep the vacuum on hand.

Collecting butterfly weed seeds can be messy

What To Do With Butterfly Weed Seeds After Harvesting

You can plant butterfly weeds seeds as soon as you harvest them, or you can store them for planting next year. Allow the seeds to dry out completely before storing them.

You can store your seeds in a plastic container (film canisters are the perfect size!), paper bag or seed envelope until spring.

I like to use a plastic shoe box to organize my seeds, or you can use a Seed Keeper.

Where To Find Butterfly Weed Seeds For Sale

It can be difficult to find butterfly weed seeds for sale, but many garden centers should carry them starting in mid-winter through early spring.

Otherwise you can always buy butterfly weed seeds online. Here are some great, quality seeds to get you started… Butterfly Weed Seeds.

If you want to learn how to grow your own seeds for your garden indoors, then my Starting Seeds Indoors eBook is perfect for you! It’s a quick-start guide that will have you growing your own seeds indoors in no time. Download your copy now!

More Posts About Saving Seeds

Share your tips for how to harvest butterfly weed seeds in the comments section below.

About Amy Andrychowicz

I live and garden in Minneapolis, MN (zone 4b). My green thumb comes from my parents, and I’ve been gardening most of my life. I’m a passionate gardener who loves growing everything from vegetables, herbs, and flowers to succulents, tropicals, and houseplants – you name, I’ve grown it! Read More.

Comments

I have a question. I was gifted with a bag of seed pods. They are still green. Can I leave them in the paper bag and will they dry out and be ready for planting? Sorry to be so dumb. I’m ;hoping they will dry out and I will be able to have wonderful butterfly bushes galore….to go along with my crocosmia plants.

Amy Andrychowicz says

If the pods are still green, then the butterfly weed seeds might not be viable. But it’s worth a try. If you have several of them, I would try cutting open a few of the green ones, removing the seeds, and letting those dry out. Then I would also try drying a few of the seed pods until they turn brown and brittle, then open them to collect the seeds. Good luck!

Steve Cochran says

I purchased Butterfly Weed seeds from the Seed Savers, and had them flower & produce seed pods their first year. Lookin forward to harvesting seeds and propagating this beautiful plant.

Amy Andrychowicz says

Wow, your butterfly weed plants flowered AND produced seed pods the first year after planting the seeds? That is amazing! Have fun collecting them for next year.

Thank you for the information on how to harvest butterfly weed seeds! Have a beautiful orange plant and want more!

Amy Andrychowicz says

You’re welcome! The seeds are very easy to collect (as long as you get to them before the wind does, LOL!). Enjoy!

Susan Sapp says

So I have cuttings from a butterfly weed perennial. I was hoping to be able to repurpose the flower or stem to plant in my garden at home. Am I out of luck? Will I have to buy the seeds to plant in the fall?

Amy Andrychowicz says

I have never tried rooting the cuttings myself, but I believe it is possible. Dust them with rooting hormone and stick them into soil. Keep the air humid, and the soil slightly moist. Otherwise, if you can get a butterfly weed seed pod from the same plant this fall, then you’ll have the seeds as a backup. Good luck!

Barbara Murray says

I successfully planted a piece of orange butterfly weed last year. A small seedling, really just one small stem, grew from a seed that must have blown from my big plant. I have several of these small seedlings around my yard now, but never had any luck transplanting them. Last Fall I tried to transplant just for the heck of it, and finally a new plant came up this summer! It got quite a bit larger and bloomed beautifully, and I’m hoping it comes back next year.

If the milkweed bugs are now on my plants, does that mean the seeds I can see are no good?

Amy Andrychowicz says

Unfortunately milkweed bugs do feed on the seed pods and the seeds too. But if your butterfly weed seed pods and/or the seeds aren’t damaged, then they should be fine.

When do you plant the seeds in NE Ohio?

Amy Andrychowicz says

You can plant them either in the fall (directly in the garden) or early spring (either directly in the garden or indoors). They would also work with the winter sowing method, if you want to experiment with that.

Kyle R. Crocker says

I have a containerized butterfly plant that has done wonderfully this summer, and has many pods now. My worry . . . In northern Minnesota, frost is coming by later October. The pods are yet green and firm. I’d like to harvest ripened pods before I transplant the parent. This is a risk. Any advice?

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P.S. I have already gathered Marsh Milkweed from the wild, nearly a month ago.

Amy Andrychowicz says

I would just leave the pods on your butterfly weed plant until they ripen. I don’t think transplanting it would make a difference. Also, butterfly weed plants are super hardy, so frost won’t hurt the plant or the seed pods.

I read somewhere that if you bring the seeds inside they need to be kept cold for an extended period of time to mimic winter conditions. So you know how cold or for how long?

Amy Andrychowicz says

I don’t think that butterfly weed seeds need cold stratification in order to germinate, but many other types of milkweed do. It certainly wouldn’t hurt to do it for your butterfly weed seeds though. You can just put them in a container the fridge for about a month, and that should do the trick.

Hi!
So first dry them out on a paper towel, then put them in fridge for a month, and then plant indoors in early spring?

Amy Andrychowicz says

Yep, that should work.

Dot Zimmerman says

How deep do you plant the seed? How many seed per area?

Amy Andrychowicz says

You don’t need to plant them very deep. The rule of thumb for planting seeds is to plant them twice as deep as the seed is wide. I would plant butterfly weed seeds maybe 1/4″ to 1/2″ deep. I would space them 2-3 inches apart, and then thin them so they are about 12-16″ apart once the seedlings start to mature. You can also just spread the seeds over the top of the dirt if you don’t want to be fussy about it. That’s the way Mother Nature does it.

Dot Zimmerman says

Patti Golliher says

Thank you for posting this information. I love attracting butterflys to my garden. I noticed the seed pods on my butterfly weed plant yesterday; I am excited to harvest the seeds so I can plant more plants next year.

Amy Andrychowicz says

Awesome! You’re welcome. Butterfly weed seeds are super easy to collect and grow. Have fun!

Susan CLARK says

Can the seeds be frozen to plant after I move to a new home?

Amy Andrychowicz says

Sure, but you don’t need to freeze your butterfly seeds to store them. It certainly wouldn’t hurt them though.

Amanda Hemmer says

Hello!
I just planted a monarch butterfly garden this spring and my butterfly weed turned out great! I noticed the seed pods and luckily found this website. The pods on one of the plants turned brown and I noticed one had started to crack open on the side. I assumed this meant it was ready for the seeds to be harvested. However, when I split open the pod what appeared to be the seed pods were white and there was no white fuzziness on the inside …. I’m worried I picked them too soon! Is there anything I can do to help them become healthy seeds?

Amanda Hemmer says

The seeds are white not seed pod, my bad!

Betty White says

It the seeds are white, why is the seeds shown on here, with the fluffy stuff, brown?

Amy Andrychowicz says

Butterfly weed seed are white first, and they turn brown as they mature. The white seeds are not mature enough to grow, so don’t harvest them until they turn brown.

Amy Andrychowicz says

Yes, unfortunately it does sound like you harvested your butterfly weed seeds too soon. It’s weird that the seed pods were brown and cracking open before the seeds were mature. Are there any other pods on the plant? If so, wait until the pods open up and the white cotton is starting to stick out before harvesting them. Otherwise, I think you’ll have to wait until next year. You could try planting the seeds you have and see if they’ll grow though, you never know.

Mike the Gardener says

Awesome post! I always love reading posts on how to harvest/save seeds from a variety of plants that grow. A big one around here is milkweed. Milkweed seeds themselves are very expensive, which is weird because it grows in abundance along roadways here in NJ.

Amy Andrychowicz says

Thanks Mike! Yes, that is weird. They get tons of seeds too, and grow like a weed.

Betty White says

I have the orange butterfly flowers (weed) but I have never seen any pods come on mine. They have stopped blooming but I have never seen any pods. (Ohio) I am going out and check now but just looked at them a few days ago and no pods. WOW what a surprise. There is several little ones on the one plant and one larger one on the other. I have another plant in another part of my yard and I will check them. So how long should I leave the pods on the plant? The larger one is yellow but the other ones that are real small, are green.

Amy Andrychowicz says

Woohoo, how exciting! It can take a few months for butterfly weed seed pods to mature. They will turn brown and split open once the seeds are ready to harvest.

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