How To Care For A Black Swallowtail Caterpillar: 14 Steps - WikiHow

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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow How to Care for a Black Swallowtail Caterpillar PDF download Download Article Co-authored by Shweta Sharma and Jennifer Mueller, JD

Last Updated: February 24, 2025 Approved

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  • Finding Butterfly Eggs
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  • Creating a Caterpillar Home
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  • Releasing the Butterfly
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  • Expert Interview
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This article was co-authored by Shweta Sharma and by wikiHow staff writer, Jennifer Mueller, JD. Shweta Sharma is a Biologist with the U.S. Environmental Protection Agency (EPA). With nearly ten years of experience, she specializes in insect management, integrated pest management, insect behavior, resistance management, ecology, and biological control. She earned her PhD in Urban Entomology and her MS in Environmental Horticulture from the University of Florida. She also holds a BS in Agriculture from the Institute of Agriculture and Animal Sciences, Nepal. wikiHow marks an article as reader-approved once it receives enough positive feedback. In this case, 95% of readers who voted found the article helpful, earning it our reader-approved status. This article has been viewed 163,340 times.

Eastern black swallowtail caterpillars are native to the eastern and midwestern United States, Canada, and Mexico. They can also be found as far west as Arizona. If you live in these areas, it's possible to adopt a black swallowtail caterpillar as a temporary pet. Enjoy the show as they grow and transform from a tiny egg through 5 stages of growth, make a chrysalis, and emerge as a beautiful blue, black, and gold butterfly.[1]

Steps

Part 1 Part 1 of 3:

Finding Butterfly Eggs

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  1. Step 1 Keep host plants such as dill and parsley in your garden. 1 Keep host plants such as dill and parsley in your garden. Black swallowtail butterflies lay their eggs on the leaves of dill, fennel, parsley, and rue.[2] These plants can easily be found at your local garden center or nursery. The plants provide food for the caterpillars once they hatch from their eggs.[3]
    • Different host plants may grow better in different areas. If your host plants don't seem to be growing well, ask around at your local nursery or farmer's market to find out which plants grow the best where you live.[4]
  2. Step 2 Plant nectar plants such as red clover to attract butterflies. 2 Plant nectar plants such as red clover to attract butterflies. Butterflies get their food from the nectar of flowers. Flowering plants that are favorites of the black swallowtail, such as milkweed, flox, red clover, and thistle, will attract these butterflies to your garden.[5]
    • Placing your nectar plants close to your host plants will encourage the butterflies to lay their eggs there.
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  3. Step 3 Locate black swallowtail eggs on the leaves of host plants. 3 Locate black swallowtail eggs on the leaves of host plants. Black swallowtail eggs are tiny yellow or golden orbs. The butterflies lay their eggs on the tops of the leaves, so they should be relatively easy to spot.[6]
    • Female black swallowtail butterflies lay between 200 and 400 eggs, at the rate of 30 to 50 a day. So don't expect to only see a few – you'll likely see dozens.[7]
    • Check your plants frequently for pests. Ladybugs, wasps, and spiders will eat butterfly eggs if they find them before you do. Keep in mind that spraying your plants with pesticides will likely harm the butterflies as well.

    Tip: You may see clear or white spheres the same size as butterfly eggs. These are empty eggshells leftover after the egg has been consumed by predators.

  4. Step 4 Snap off the part of the plant with eggs on it. 4 Snap off the part of the plant with eggs on it. When you've found eggs, don't try to remove them from the plant. Instead, gently snip off the plant along with the eggs and carry it inside.[8]
    • You'll typically find multiple eggs on a single leaf or branch. Go ahead and transfer all of the eggs together – especially since some of them likely won't hatch.
    • You also have the option of waiting until the eggs have hatched and adopting a caterpillar instead. This may eliminate some of the guesswork of whether or not the eggs will hatch.
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Part 2 Part 2 of 3:

Creating a Caterpillar Home

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  1. Step 1 Find a large jar that will hold the piece of the plant with eggs on it. 1 Find a large jar that will hold the piece of the plant with eggs on it. Your caterpillar isn't picky when it comes to the container you place it in. Any jar or plastic bin will work fine – just make sure you use something you can see through so you can watch the caterpillar hatch from its egg and go through its 5 stages of growth.[9]
    • At this stage, you can close the lid or seal the container. This will help keep the eggs from being disturbed by outside elements.
    • The egg stage lasts between 4 and 10 days. The eggs will turn dark gray or black before they hatch.[10]
  2. Step 2 Provide fresh air once the eggs hatch. 2 Provide fresh air once the eggs hatch. When the eggs hatch, you'll see tiny black creatures on the leaves instead of eggs. At this point, remove the lid from the container and cover it with mesh or a paper towel to allow fresh air to get in.[11]
    • Don't worry about the size of the mesh – your caterpillars won't escape. They're far more interested in eating the food that's available for them.
    • Don't expect all the eggs to hatch. Only about 1 out of every 100 black swallowtail eggs makes it through all the life stages to become a butterfly.[12]
  3. Step 3 House your caterpillars in a large jar or plastic container. 3 House your caterpillars in a large jar or plastic container. If you're keeping the caterpillars inside, you have many different options to house and protect them as they grow. Make sure you choose one that allows you to watch the caterpillar as it goes through its life stages.[13]
    • A large jar or plastic container is fine for a single caterpillar – just make sure it has enough height that you can keep a vertical branch for the caterpillar to hang its chrysalis when it gets to that stage.
    • If you have multiple caterpillars, you can also use an aquarium or even a reptile cage.
  4. Step 4 Feed your caterpillar fresh host plant cuttings daily. 4 Feed your caterpillar fresh host plant cuttings daily. Black Swallowtail caterpillars eat a lot. Make sure there are plenty of cuttings in the caterpillar enclosure. Generally, you want to use the same plant where you originally found the caterpillar's eggs.[14]
    • You can experiment with other plants as well. Black Swallowtail caterpillars eat dill, fennel, parsley, and rue[15] . Especially in the later stages of development, caterpillars typically become less picky about what they eat.
    • Some caterpillars may eat plants that you bought in a grocery store, but this generally isn't a good idea. The plants may have been treated with pesticides that could harm your caterpillar, and you wouldn't have any way of knowing until it was too late.
    • Black swallowtails remain caterpillars for 3 to 4 weeks. If your caterpillar stops eating after 3 or 4 weeks, that's typically a sign that it's about to make a chrysalis.[16]

    Tip: Although it's technically safe to touch or hold a black swallowtail caterpillar, it may not be the best idea. They are very delicate. Additionally, when disturbed, a bright orange, 2-pronged fork will emerge from behind its head. This osmeterium emits an unpleasant smell, similar to rotten cheese, as a defense when the caterpillar is disturbed.

  5. Step 5 Include a branch for the caterpillar's chrysalis. 5 Include a branch for the caterpillar's chrysalis. When your caterpillar reaches its final stage of growth, it will make a chrysalis off of a branch. The chrysalis will hang from the branch in the open air, attached by silk threads the caterpillar creates.[17]
    • It doesn't have to be a particularly large branch – however, it does need to be sturdy enough to support the caterpillar. If your caterpillar can walk from one end of the branch to the other, it should be fine.
  6. Step 6 Clean the caterpillar droppings at least once a day. 6 Clean the caterpillar droppings at least once a day. Since caterpillars eat a lot, they also generate a lot of waste. If you don't clean your caterpillar's enclosure at least once a day, you'll start to have a pretty stinky mess.[18]
    • You can try placing the caterpillar in a jar or vase, then gently turning the jar or vase upside down on a sheet of newspaper. The droppings will fall on the newspaper and can be easily disposed of. Then all you have to do is replace the newspaper. Make sure your caterpillar is clinging to a leaf or branch when you turn it over.
    • Your caterpillar will outgrow its skin and molt 5 times. They typically eat the molted skin, but you may also need to clean remnants from the bottom of the caterpillar's enclosure.[19]
  7. Step 7 Watch for signs that the caterpillar is ready to form a chrysalis. 7 Watch for signs that the caterpillar is ready to form a chrysalis. When your black swallowtail caterpillar is ready to form a chrysalis, it will stop eating. You'll see it curl its head under its body, so it looks like an upside-down "J."[20]
    • If you look closely, you'll also see a silk button and belt forming. These threads are used to secure the chrysalis to the branch while the caterpillar completes its transformation into a butterfly.
    • Once the caterpillar is attached to the branch, it will hang there for about 24 hours before shedding its skin to reveal the chrysalis.
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Part 3 Part 3 of 3:

Releasing the Butterfly

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  1. Step 1 Clear space in the enclosure for the butterfly to emerge. 1 Clear space in the enclosure for the butterfly to emerge. After your caterpillar forms a chrysalis, it will hang for 1 to 2 weeks. The butterfly needs to be able to hang from the branch with its wings down. Remove any branches or cuttings crowding the area around the chrysalis, so the butterfly will have room to hang and stretch its wings without injury.[21]
    • Since the caterpillar in its chrysalis isn't going to eat anything, you can also remove extraneous cuttings or other materials from the enclosure.
    • Don't handle or attempt to move the chrysalis – you could kill the creature inside.
  2. Step 2 Wait for the butterfly to emerge from the chrysalis. 2 Wait for the butterfly to emerge from the chrysalis. Within a couple of weeks, the chrysalis will turn dark, then become clear as the black swallowtail butterfly emerges. It may take a few minutes or even a few hours for the butterfly's wings to harden. When they start to gently flutter, your butterfly is ready to fly.[22]
    • A black swallowtail butterfly typically emerges from its chrysalis in the early morning hours, just after sunrise.[23]
  3. Step 3 Carry the butterfly outside on a stick or potted plant. 3 Carry the butterfly outside on a stick or potted plant. Some black swallowtail butterflies will fly straight out of an open jar or vase, but others need a little more prodding to take wing. You can gently take out the stick the butterfly is resting on and carry it outside.[24]
    • If you take the whole enclosure outside, simply set it down in a sunny spot and wait for the butterfly to take to the air. Don't shake or tap on the enclosure – you'll disturb the butterfly and could injure it.
    • You can also see if your butterfly will come to rest on your hand, but be careful not to touch its wings. They are fragile and you could injure the butterfly without even realizing it.

    Tip: Although some people like to keep the butterfly as a pet, this isn't the kindest thing for the butterfly. Black swallowtail butterflies only have a lifespan of 2 to 4 weeks, so it's better to let it enjoy its freedom.

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Community Q&A

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  • Question I have 6 black swallowtail caterpillars in a container. They ate all of my parsley and started on basil. I am going to feed them parsley and hope they turn into butterflies. I would let them eat the basil, but found no info on whether they should or not - is this OK? Community Answer Community Answer If your caterpillars are eating the basil, it is a high chance that it's fine. Most caterpillars would rather die of hunger than eat an unknown plant. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 11 Helpful 56
  • Question I had 8 black swallowtail caterpillars in my fennel yesterday. This morning there were only three, and now, none. Where did they go? Do they travel to pupate? I'm worried. Community Answer Community Answer There can be many factor a to why they have disappeared. 1. Predators could have found them to dine on. 2. They could have fallen from the fennel and found a new host plant to munch on. 3. Depending on the stage they are in, they could have searched out a place to form their chrysalis. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 5 Helpful 36
  • Question Yesterday I had 8 black swallowtail caterpillars on my fennel. Today, there are only 3! Where did they go? Community Answer Community Answer They could have gone to another place in your garden or gotten eaten by some other animal. The possibilities are endless. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 8 Helpful 27
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Video

Tips

  • If the chrysalis does not form until late-summer, the butterfly may overwinter in the chrysalis. Don't assume the butterfly is dead – it will emerge the following spring.[25] Thanks Helpful 1 Not Helpful 0
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Things You'll Need

  • A glass jar or similar container
  • Paper towels or mesh netting
  • Fennel, dill, or parsley to feed the caterpillars

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Expert Interview

Thanks for reading our article! If you’d like to learn more about caring for insects, check out our in-depth interview with Shweta Sharma.

References

  1. ↑ http://www.raisingbutterflies.org/eastern-black-swallowtail/
  2. ↑ Shweta Sharma. Biologist. Expert Interview
  3. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  4. ↑ https://www.joyfulbutterfly.com/butterflies/black-swallowtail-butterflies-indoors/
  5. ↑ https://www.joyfulbutterfly.com/butterflies/black-swallowtail-butterflies-indoors/
  6. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  7. ↑ https://www.butterfliesathome.com/black-swallowtail-butterfly.htm
  8. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  9. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
More References (16)
  1. ↑ https://www.butterfliesathome.com/black-swallowtail-butterfly.htm
  2. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  3. ↑ https://www.joyfulbutterfly.com/butterflies/black-swallowtail-butterflies-indoors/
  4. ↑ http://www.raisingbutterflies.org/eastern-black-swallowtail/
  5. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  6. ↑ Shweta Sharma. Biologist. Expert Interview
  7. ↑ https://www.butterfliesathome.com/black-swallowtail-butterfly.htm
  8. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  9. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  10. ↑ https://roadsendnaturalist.com/2013/04/27/black-swallowtail-eggs-and-larvae-revisited/
  11. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  12. ↑ https://www.joyfulbutterfly.com/butterflies/black-swallowtail-butterflies-indoors/
  13. ↑ https://texasbutterflyranch.com/2014/07/01/how-to-raise-eastern-swallowtail-butterflies-at-home/
  14. ↑ https://www.joyfulbutterfly.com/butterflies/black-swallowtail-butterflies-indoors/
  15. ↑ https://www.joyfulbutterfly.com/butterflies/black-swallowtail-butterflies-indoors/
  16. ↑ https://www.joyfulbutterfly.com/butterflies/black-swallowtail-butterflies-indoors/

About This Article

Shweta Sharma Co-authored by: Shweta Sharma Biologist This article was co-authored by Shweta Sharma and by wikiHow staff writer, Jennifer Mueller, JD. Shweta Sharma is a Biologist with the U.S. Environmental Protection Agency (EPA). With nearly ten years of experience, she specializes in insect management, integrated pest management, insect behavior, resistance management, ecology, and biological control. She earned her PhD in Urban Entomology and her MS in Environmental Horticulture from the University of Florida. She also holds a BS in Agriculture from the Institute of Agriculture and Animal Sciences, Nepal. This article has been viewed 163,340 times. 102 votes - 95% Co-authors: 15 Updated: February 24, 2025 Views: 163,340 Categories: Butterflies and Moths Article SummaryX

To care for a black swallowtail caterpillar, keep it in a large jar or plastic container, and place a vertical branch inside so the caterpillar has something to make a chrysalis off of. You should also feed the caterpillar fresh plants, like dill, fennel, parsley, and rue, as long as the plants haven't been treated with pesticides. Also, clean out any droppings at the bottom of the container at least once a day. Once the caterpillar makes a chrysalis and emerges as a butterfly, take it outdoors so it can fly away. To learn how to find black swallowtail caterpillar eggs, read on! Did this summary help you?YesNo

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Reader Success Stories

  • Patrice Wilson

    Patrice Wilson

    Oct 4, 2016

    "I found about 40 caterpillars on my lemon and lime trees. It hadn't occurred to me that they were moths or..." more
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Did this article help you?

Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Shweta Sharma Co-authored by: Shweta Sharma Biologist Co-authors: 15 Updated: February 24, 2025 Views: 163,340 95% of readers found this article helpful. 102 votes - 95% Click a star to add your vote Patrice Wilson

Patrice Wilson

Oct 4, 2016

"I found about 40 caterpillars on my lemon and lime trees. It hadn't occurred to me that they were moths or..." more BJ Briggs

BJ Briggs

Jul 20, 2022

"We have raised numerous black swallowtails and monarchs but this informative article is still very helpful, well..." more Daniel Owens

Daniel Owens

Jul 8, 2020

"I am 'raising' 3 caterpillars to become black swallowtail butterflies, which I will release when..." more Karen Sanchez

Karen Sanchez

Aug 7, 2017

"This article helped me a bunch! The swallowtail I raised (following these simple steps) became a chrysalis..." more Rated this article: Helen Mastrangelo

Helen Mastrangelo

Jul 25, 2017

"My swallowtail caterpillar is grown, he had a loose black stool and cannot rest. I thought he would be ready to..." more Share yours! More success stories Hide success stories

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