Gardener Watches Cocoon In Her Backyard For 10 Months – Then A Miracle Happens
Portland resident Tiffany Garner, a professional gardener, observed a polyphemus moth larva transform from a finger-sized caterpillar into a six-inch moth over several months in her backyard. According to Garner, the insect overwintered in a hard, tan-colored cocoon on her porch after she transferred it from her yard to a planter in the fall.
How to Identify a Polyphemus Moth Larva
The polyphemus moth is characterized by its large, “chubby” appearance and neon green coloring during the larval stage. Garner, who works in professional gardening, noted she had never encountered a caterpillar of that size in her daily work. Identification is typically confirmed through species identification apps.
Polyphemus moths are silk moths. Their wingspan can reach six inches.
What Happens During the Overwintering Process?
When polyphemus caterpillars form their cocoons in the late fall in an area with a cold climate, they will overwinter in their chrysalises and hatch only when the weather warms up. In Garner’s case, the cocoon remained from September until June.
Signs That a Moth Is Ready to Emerge
Garner reported finding a hole in the cocoon on a warm afternoon in June, indicating the moth had emerged. Upon emergence, the female moth—identified by her short antennae—remained stationary for a period to adjust to being out of the cocoon before flying away.
Pro Tip: Supporting Local Pollinators
If you find a caterpillar, avoid moving it unless it is in a hazardous location. If you must relocate it, place it on a native host plant. Keeping a “wild” corner in your garden provides the necessary shelter for native species to complete their life cycles undisturbed.
Frequently Asked Questions
How long do polyphemus moth cocoons stay dormant?
They typically remain in the cocoon from late fall until the weather warms up, depending on local climate conditions.
How can you tell if a polyphemus moth is male or female?
According to observations by Garner, the female is identified by her short antennae.
Should I interfere if I find a cocoon in my yard?
Garner provided a safe place for the animal to spend the winter.
Have you ever witnessed a unique insect transformation in your own garden? Share your experiences in the comments below or subscribe to our newsletter for more tips on supporting your local ecosystem.