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by Anthony Gomez

2 months ago

Raising Butterflies Blog

Is Your Caterpillar Cage Killing Monarch Butterflies?

by Anthony Gomez

2 months ago

Is Your Caterpillar Cage Killing Monarch Butterflies?

by Anthony Gomez

2 months ago

While many cage options are somewhat effective, the majority leave the door open for the unnecessary hardship of losing your monarch butterflies before their time. Poorly designed cages are the catalyst for escapes and disease outbreaks which could ultimately kill your caterpillars or cripple your butterflies.

While fancy DIY cages may be more visually appealing, they can contribute to monarch disease/death in the following ways:

  • Difficult to clean properly, which could lead to disease outbreaks
  • Some are not designed for Houdini-like caterpillar escapes
  • Many raise caterpillars and butterflies together inside these cages. OE disease spores fall off the butterflies’ wings and down to the caterpillars’ milkweed, spreading the deadly parasites to the next generation.


Which Caterpillar Cage Ideas Minimize Monarch Loss?

There are basically two types of caterpillar cages I use for rearing monarch butterflies. By using these cages, we never lose monarchs…or lose them to disease!


1. Plastic Food Storage Container for Monarch Eggs

Monarch Egg Hatchery- Plastic Food Storage Containers are a great place for hatching monarch eggs. Secure the lid to keep the leaves from drying out and to keep your bay caterpillars from escaping.
Smart Start

Line the bottom of the container with a paper towel and place leaf pieces with eggs inside. Spray the leaves lightly w/ water every other day. Secure the lid. No air holes are necessary, as checking on eggs daily provides more than enough oxygen.

Do not place these indirect ☀️.

Use household food containers as a nursery to hatch monarch eggs- butterfly cage ideas

Food storage containers are a fantastic hatchery and milkweed stays fresh in this humid climate.

9” x 9” x 3h” (9 cup) and 11” x 8” x 3h” (9.6 cup pictured above) are two container sizes we use regularly.

Make sure you spread out the eggs to protect them from wandering baby caterpillars…we put about 20 monarch eggs in the 11″ container.

You can find a wide assortment of food storage containers at most big box stores or get the 9 cup rubbermaid option we use here:

Food Storage Containers for Hatching Eggs and Baby Caterpillars

After the baby monarch caterpillars emerge, I place the a small caterpillar-occupied leaf piece on a fresh large milkweed leaf or cutting, and place it inside one of the next cages, where there is better air flow…

If you are able to bring in monarch eggs on stem cuttings, you can forgo the food containers and place the cuttings in a larger mesh cage: 

How to Use Stem Cuttings for Monarch Eggs


The following are our preferred raising cages for a few reasons…


2. Mesh Pop-up Butterfly Cages

Raise up to 30 monarch caterpillars at once in the big cube butterfly cage + 6 floral tubes to use for milkweed stem cuttings. More Photos and Info here...
Raise More Monarchs!

  • Breathable mesh cage keeps air flowing and humidity levels down for healthy caterpillar growth
  • Clean cage without disturbing chrysalises in a side-opening caterpillar cage
  • Small caterpillars can’t escape tiny mesh holes
  • Mesh sides can receive direct sun without ‘cooking’ the caterpillars
  • No dangerous nooks and crannys like laundry hamper pop-ups
  • Clean frass (poop) with keyboard vacuum or use the poo poo platter
  • Use as a butterfly cage to release butterflies or keep during inclement weather
  • Use a 5% bleach solution to clean cage between batches
  • rinse out, then sun dry

Buy a Baby Cube Cage 15″ x 15″ x 15″ to Raise Monarchs on Stem Cuttings or Individual Leaves

Buy a TALL baby Cube Cage 15″ x 15″ x 24″ to Raise Monarchs on Stem Cuttings or Small Potted Plants

Buy a BIG Cube Cage  24″ x 24″ x 24″ to Raise Monarch Caterpillars on Stem Cuttings or Small Potted Plants

Buy a Monarch TOWER Cage 24″ x 24″ x 36″ to Raise Monarchs on Stem Cuttings or Large Potted Plants

Raise up to 15 monarch caterpillars in the baby cube butterfly cage. Viewing window allows you to see the monarch life cycle first hand. Get more info and find the perfect caterpillar cage for raising happy, healthy monarch butterflies.

Using these monarch butterfly cages, my survival rate is consistently over 95% and I never have issues losing caterpillars to daring escapes or deadly disease. 💀

These cages should help make your raising efforts more successful too!

Learn more about my raising process in Bring Home the Butterflies 2:
Raise MORE Monarchs, with LESS effort, and AT LEAST a 90% Survival Rate

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