How to Keep a Moth Cocoon

Written by kimberly caines Google
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How to Keep a Moth Cocoon
A caterpillar transforms into a moth inside a cocoon. (Brand X Pictures/Brand X Pictures/Getty Images)

Observing the transformation of a caterpillar into a moth is both fascinating and educational. Once your caterpillar makes its cocoon there is a period of inactivity where you must be patient. Minor but proper care of the cocoon is required up until the moth emerges. Improper care of the moth's cocoon can result in it hardening, darkening and drying. This is an indication that the pupa, or developing moth, died.

Skill level:
Moderately Easy

Things you need

  • Jar
  • Soil or sand
  • Twigs or sticks
  • Paper towel
  • Sticky tape
  • Cheese cloth
  • Rubber band
  • Spray bottle

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  1. 1

    Keep your cocoon in an aquarium or in a wide-mouthed, one-gallon jar. Some caterpillars make their cocoons underground while others make them above ground. If you're not sure which type of moth species you have, provide 2 inches of moist soil or sand and position small twigs or sticks against the side of the jar. The caterpillar will form its cocoon in the soil or it will hang it from a twig.

  2. 2

    Hang a moistened paper towel in the jar. Tape it at the top of the jar so it hangs all the way to the bottom. The moist paper keeps the humidity in the jar high, which is essential to have a healthy cocoon.

  3. 3

    Check the location of the hanging cocoon and carefully move it if needed. Create plenty of space around the cocoon so the moth can fully expand its wings upon emerging without touching the ground. If it cannot do this, its wings may not fully form and it may not be able to fly.

  4. 4

    Place cheesecloth over the opening of the jar and secure it with a rubber band. Cheesecloth allows proper ventilation. Avoid using a lid with holes punched into it because this is inadequate ventilation and the sharp edges may harm the caterpillar.

  5. 5

    Fill a spray bottle with room temperature water and mist the cocoon every other day to keep it moist. Aim for a water temperature that ranges between 20 to 22.2 degrees Celsius. There is no need to provide food for cocoons.

  6. 6

    Wait two to three weeks for your moth to emerge from its cocoon. Your moth will most likely sit on the moist paper towel to allow its wings to dry. Moths feed on their body fat so there is no need to provide food for them.

Tips and warnings

  • If after three weeks your moth hasn't emerged, place your cocoon in the refrigerator at 7.22 degrees Celsius; your moth may be hibernating. Remove the cocoon from the fridge after two weeks and start the misting process at room temperature over again.

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