Butterfly weed: Fun Facts

Posted on June 28, 2023 by Scott Vogt

One of the most iconic prairie wildflowers is Asclepias tuberosa, commonly referred to as butterfly weed or butterfly milkweed. From May to July, its bright orange flowers dot the prairie landscape. These attractive flowers are a magnet for many different pollinators, including the monarch butterfly.

Butterfly weed can be found in dry fields, meadows, prairies, open woodlands, canyons and on hillsides. It grows on loamy and sandy, well-drained soils, in areas that provide plenty of sun. It is consistently the most sought after prairie wildflower for a garden and the flowers work well in bouquets.

*Darker orange blooms with red pigment in the flower*

Butterfly weed (Asclepias tuberosa): Did You Know…?

The flower color in Asclepias tuberosa ranges from deep red-orange to a rich yellow, depending on the amount of red pigment which is superimposed over the yellow carotenoid background pigments. The flower color has nothing to do with the soil type.
This species can be found in the eastern two-thirds of the state of Kansas.
Butterfly weed is also known as “butterfly milkweed”, even though it produces translucent (instead of milky) sap.
The scientific name Asclepias comes from Asklepios, the Greek god of medicine. tuberosa refers to thick tuberous roots which make it very difficult to transplant from the wild. Please don’t dig mature plants from the prairie.
Root of butterfly weed was used in treatment of pleurisy, bronchitis and other pulmonary disorders in the past. Don’t try this at home.
Butterfly weed can be also used in treatment of diarrhea, snow blindness, snakebites, sore throat, colic and to stimulate production of milk in breastfeeding women. Again, don’t try this at home.
The small individual flowers consist of 5 petals. Each milkweed blossom is equipped with a trap door, called a stigmatic slit. When insects land on their pendulous flowers, they must cling to the petals as they feed on nectar. As they forage on the flower for nectar, their foot slips into the stigmatic slit and comes in contact with a sticky ball of pollen, called a pollinium. When the insect pulls its foot out of the trap door, it brings the pollinium with it. Eventually, the insect will move on to the next flower. Should that same foot slip back into another milkweed flower’s stigmatic slit, the pollen can be transferred and pollination is completed. This process is quite amazing to watch.
Typically, it takes three years for a butterfly weed to start producing flowers.
The long narrow fruit pods develop later in summer. These hairy green pods ripen and ultimately turn a tannish-brown in the fall. Each pod contains hundreds of seed equipped with silky, white tufts of hair. As the pod dries and splits in the fall, the seeds are carried away by the breeze. Those white tufts of hair act as tiny parachute-like structures that disperse the seeds.
As with other milkweeds, butterfly weed will attract aphids; you can leave them for ladybugs to eat or spray the insects and foliage with soapy water.

Butterfly weed is a garden worthy wildflower. It doesn’t spread aggressively like other milkweeds, but rather stays as a nice upright clump. Its many ornamental and functional assets, plus its rugged character will make it a focal point in the summer garden for years to come. You will be rewarded as pollinators seek out the beautiful iconic flowers of this native wildflower. Give it a try!

*Orange and yellow butterfly weed blooming in the same flower bed*

Planting for Pollinators

Posted on July 5, 2017 by Scott Vogt

Last week, I was visiting with someone about pollinators or the lack thereof. It seems that we had an initial flush of monarchs and other beneficial insects earlier this spring, but since then many of the pollinators have become scarce. There are beautiful wildflowers in bloom but very little insect activity. We have all seen the dramatic statistics tracking the plight of pollinators and their losses, so what is happening?

That is a difficult question, because there are often a combination of factors that are associated with the demise of many of the pollinators we take for granted. Pollinators have been impacted by habitat loss, pesticides, pathogens, mites, invasive species of plants, parasites and an erratic climate. Different species are affected by different forces, but overall the result is the same, fewer pollinators.

So what can we do to help pollinators? Here is a list of ways that any gardener can have an impact.

Plant Pollinator-Friendly Plants

Certainly, milkweeds are the best wildflowers for attracting monarchs to your yard. We have seen this throughout the Arboretum as caterpillars munch on the milkweed leaves. Other blooming wildflowers offer their nectar to a host of insects. The wildflowers are the buffet. I like to have members of the aster family such as coneflowers, asters, goldenrods, blackeyed susans and blazing stars. (Peruse our native plant list and sample landscape designs for some inspiration.)

Tiger Swallowtail butterfly on a Gayfeather. Photo by Janelle Flory Schrock.

Plant for All Life Stages

We recommend planting wildflowers that bloom at different times of the year. A mixture of wildflowers coming into bloom and going out of bloom throughout the year provides a ready food source for adults and their larvae. This approach mimics the natural prairie and the changing seasons. Maybe plant some dill or Zizia sp. for the swallowtail butterfly caterpillars.

Monarch caterpillar on milkweed. Photo by Brad Guhr.

Provide Habitat

When you design your landscape, remember to layer trees and shrubs along with wildflowers and grasses. These plants provide shelter from the wind along with nesting sites and food for birds, butterflies and bees. This created habitat is a safe environment for pollinators to find all they need including food, shelter and water. Even a small garden can have a tremendous impact.

Bee Hotel. Photo by John Regier.

Provide Water

We all need water for survival. Pollinators need it too. A clean source of water such as a birdbath, basin, or hollow stone is enough water for pollinators. These features also provide landing spots so that pollinators have a perch. Here are some great plants to complement your water feature.

Pearl Crescent Butterfly. Photo by Dave Osborne.

Reduce Chemicals

There is growing research on the detrimental effects chemicals have on pollinators. Any time we can reduce or eliminate the use of chemicals in the landscape, we are impacting wildlife in a positive way. Allow insects to control unwanted pests. Be willing to accept a few damaged plants, knowing that by not spraying you are saving much more in the long run.

Bumblebee on Echinacea purpurea. Photo by Janelle Flory Schrock.

Learn About the Plight of Endangered Pollinators

There is so much to learn about each type of pollinator. When are they out in the garden? What do they need to complete their lifecycle? Where do they migrate or how do they overwinter? We have so much to learn about these important insects. (One good resource for this is this book, by Heather Holm, which we often carry in our gift shop. Check out MonarchWatch.org or the Xerces Society for Invertebrate Conservation for great resources.)

Gray hairstreak on Eryngium leavenworthii. Photo by Brad Guhr.

Pollinators live perilous lives. Their very existence hangs by a thread. We need them for the food we eat. Plants need pollinators for their survival. So much depends on these tiny little insects. As gardeners, we can support the life cycles of pollinators by including a wide variety of plants in our landscapes. Native wildflowers are the best option to help them prosper. They need our help and you can be part of the solution. You will be amazed at how many pollinators you will see when you introduce just a handful of wildflowers to your landscape.

Three Reasons I Am Intrigued by the Monarch Migration

Posted on September 30, 2015 by Scott Vogt

Last week (late September) the Monarchs began to congregate in the arboretum. There are hundreds of them hanging from the branches in the hedgerow of our amphitheater. They are pooling here until the next north wind can help push them south.

In the last few years, we have only seen a handful in the arboretum during their annual migration. When I first started working here many years ago, they would cover the trees, turning them orange and black. We have certainly seen the decline of the population since then, but I am hoping the Monarchs hanging from the trees today signal a turn-around of the decrease encountered since the 1990s.

It is a wonderful and exciting sight to see so many of them. I could spend hours watching the Monarchs. They are mesmerizing, thought-provoking and captivating all at the same time. Here are three reason why they intrigue me so much.

1. They are delicate but strong.

How can something so beautiful and fragile make the nearly 2000 mile journey from Canada to central-Mexico? Every autumn, millions of monarch butterflies survive this incredible journey. From start to finish it takes them two months to make the trip. These delicate monarch butterflies are a marvel of nature. We admire their beauty and endurance. If you really think about it, the migration is one the most amazing in the natural world.

2. They love milkweeds and find them in the landscape.

I have heard that Monarchs can smell milkweeds from over two miles away. It may be from even further away if the milkweed population is large. Wow, do they have good senses, but their survival depends on them finding milkweeds.

Monarchs use receptors on their antennae to “smell” the milkweeds in your landscape. As they get closer to the plants, sight takes over to land on the actual plant. They make the final assessment of the plants with receptors on their feet. So more milkweeds in your landscape will only increase the odds of attracting Monarchs to your garden.

Baby Monarch Caterpillar

3. They use the winds to aid their migration.

As they have been resting and waiting at the arboretum this week, the Monarchs have been feasting on the wildflowers in bloom such as asters, goldenrods, and sunflowers. I anticipate their departure as soon as the next north wind comes sweeping down the plains.

They use the updrafts called “thermals” and prevailing winds to their advantage, much like migrating birds, to preserve energy. Their flapping wings can propel them southward at speeds ranging between 10 to 25 miles an hour. Monarchs can travel 50-100 miles per day to complete the two months journey. There will be time to rest when they finally make it to the warm Central Mexican Oyamel fir forests in the Michoacan hills.

The annual Monarch migration is a magical event. These winged wonders captivate my/our attention every year. How can something so small go so far? It is truly extraordinary how they flutter all the way south. They are worth saving. Join me in planting milkweeds and establishing the habitat sanctuaries they need. We can all be part of the solution.

Plant Profiles: Butterfly Milkweed

Posted on June 24, 2015 by Scott Vogt

As I drove through the Flint Hills this week in late June, there were orange dots among the prairie grasses that caught my eye. Few plants found on the prairies of Kansas are as readily recognizable as butterfly milkweed (Asclepias tuberosa). This classic prairie plant found throughout the eastern two-thirds of Kansas blooms from late May into August.

Butterfly milkweed is a stout one to two foot tall perennial with a deep, coarse, fibrous root system. Flowers range from deep orange-red in the eastern part of its range to lighter orange and finally yellow farther west and south in Kansas. Unlike the numerous other milkweeds found in Kansas, butterfly milkweed does not exude a white milky sap when the stem is cut or a leaf is removed.

Butterfly weed

Generally available in garden centers and nurseries as well as our FloraKansas Plant Sale, butterfly milkweed can easily be used in a perennial border or in wilder, more naturalistic plantings. Somewhat slow to establish because of the coarse roots, butterfly milkweed is a long lived plant and an excellent competitor in the garden when challenged by more vigorous plants.

While it prefers full sun and good drainage, it will tolerate light shade. It is also very drought tolerant once established. Several cultivated varieties of butterfly milkweed have been developed. These include ‘Gay Butterflies’, a mix of red, orange, and yellow flowered plants, and ‘Hello Yellow’, an exclusively yellow flowered selection.

Hello Yellow Butterfly Milkweed

The common name is derived from the blossom’s ability to attract butterflies and a host of pollinating insects. The complex flowers actually have pollen sacs attached to a y-shaped structure or stirrup. These structures attach to visiting insects and are consequently carried off to the other flowers in the vicinity, allowing cross pollination to occur. Fruits are long, skinny pods, typically three to six inches long. These contain many seeds, each having a tuft of white, silky hairs. As the pod dries and splits in the fall, the seeds are carried away by the breeze, each equipped with a tiny parachute-like structure.

Do your garden a favor and include some butterfly milkweed. Its many ornamental and functional assets, plus its rugged character will make it a focal point in the summer garden for years to come. Plus, you will be rewarded as pollinators such as Monarchs seek out this beautiful native wildflower.