On Rearing Monarchs - Yes or No?

Keep Monarchs Wild: Why Captive Rearing Isn’t The Way To Help Monarchs

By Emma Pelton on 15. June 2023 - Xerces Society

A version of this blog was originally published in September, 2018.

Instead of rearing—which is risky and unproven in helping monarchs—we should focus on more effective ways to conserve these glorious wild animals.

Try to make the process as close to Mother Nature's version as possible.

If collecting eggs, pull the entire stem or leaf and keep it fresh in water as long as possible. If the leaf dries, so will the egg.
We suggest using mesh containers, kept outdoors in the shade, away from where they may get sprayed with any chemicals. Fresh air, and normal fluctuations in temperature and light reflect Nature's way.
Only 1-2 caterpillars per container. How often in nature do you see more than one caterpillar on a stem of milkweed? Rarely. They can accidentally cannibalize each other.
Use fresh milkweed stems daily. A large bottle with a narrow opening works well for stability, or use a vase with a broad base, and fill in the top with paper towels or something that will stop an accidental drowning if a caterpillar falls in. Trust me on this one, you'll feel really bad if they do.
Clean out frass (caterpillar poop) daily so they aren't crawling in it.