Painted Lady (Cosmopolitan)
Vanessa cardui
Darwin Core (DwC) Taxonomic Classification
Vanessa cardui (Linnaeus, 1758)
Quick Rearing Snapshot & Biology Overview
Rearing and biology notes for Painted Lady (Cosmopolitan)
Thistles (Cirsium spp.), Common Mallow (Malva neglecta), Hollyhocks (Alcea rosea)
~24 Days total (Egg → Butterfly)
Southward Migration
Vertical J-Hang
Thermal Degree-Day Hatch SimulatorInteractive
Slide ambient temperature to see how heat accelerates metamorphosis for Painted Lady (Cosmopolitan)
*Calculated via standard insect thermal summation models (base threshold 50°F / 10°C).
Raising Painted Lady (Cosmopolitan) in the Classroom?
Access our free 4-Week NGSS Metamorphosis Unit, printable daily growth observation logs, student job badges, and certified release certificates.
Painted Lady
Vanessa cardui (Linnaeus, 1758) — Nymphalidae • Nymphalini
- Salmon-orange, rose, and ochre mottled ground color
- Black forewing apex containing 5 prominent clear white spots (largest is a distinct bar)
- Hindwing submarginal row of 4 small circular black eyespots (without blue centers on dorsal side)
- Most cosmopolitan butterfly species on Earth, capable of trans-Saharan desert migrations
Larval Host Flora:
Silo 02 BotanyOnly supply fresh, pesticide-free foliage from these verified native botanical species:
- •Thistles (Cirsium spp.)
- •Common Mallow (Malva neglecta)
- •Hollyhocks (Alcea rosea)
- •Cheeseweed (Malva parviflora)
- •Stinging Nettle (Urtica dioica)
- •Borage (Borago officinalis)
- •Sunflowers (Helianthus spp.)
Key Husbandry Tips
Silo 04 Husbandry- •Caterpillars naturally spin individual protective silk tents inside leaves or across diet cups — this webbing is normal, protective behavior.
- •Can be raised on commercial artificial mallow/wheat-germ diet cups OR fresh pesticide-free thistle, mallow, or hollyhock leaves.
- •If transferring from diet cup lid to a mesh enclosure, gently pin the paper disk with the hanging chrysalis to the ceiling using masking tape or safety pins.
- •Humidity is held around 40 to 50%: condensation inside sealed plastic cups leads to bacterial septicemia, which is fatal.
- •Raising painted ladies from diet cup to release covers silk webbing, moving the chrysalis disc, meconium and release.
- •The classroom habitat guide covers running painted ladies as a K-12 unit.
- •Setup, time and cost with children are laid out for a home or classroom cage.
- •Painted ladies, monarchs and black swallowtails are compared by food source, egg-to-adult time and leaf washing.
The Great Painted Lady Migration (Continuous Breeding & Desert Irruptions)
Strategy: Multigenerational Transcontinental & Irruptive Desert Migration
Unlike Monarchs that migrate to one specific mountain grove, Painted Ladies (Vanessa cardui) engage in a continuous multigenerational circumpolar relay migration spanning up to 9,000 miles across North America, Europe, and the Sahara Desert.
Does not enter winter diapause; as cold temperatures arrive in autumn, adults fly southwards to the Sonoran Desert, Mexico, and the Gulf Coast to continue breeding continuously.
Adults utilize high-altitude tailwinds (up to 3,000 feet elevation) to travel up to 100 miles per day at speeds exceeding 30 mph, riding warm frontal weather systems.
Painted Ladies do not survive freezing winters in outdoor northern cages, so captive adults raised in autumn are released on sunny, warm afternoons above 55°F (13°C), facing southward.
Painted Ladies run through egg, larva and pupa faster than most species reared indoors, eat an easily preserved artificial wheat-germ/mallow paste rather than a fresh host plant, and are non-toxic and legal to rear across all 50 US states and Canadian provinces. The stage lengths are on this page.
That is protective silk webbing spun by the caterpillars! In nature, larvae use silk to stitch leaves into private feeding tents to hide from predatory birds and parasitoid wasps.
Yes. They take fresh, unsprayed Common Mallow, Hollyhock leaves, Stinging Nettle and Thistle. Once caterpillars have started on fresh leaves they are not switched back to paste.
Yes! Painted Lady chrysalises often gleam with opalescent metallic gold or silver tubercles along their dorsal ridges. These reflect light in nature to mimic dew drops on leaves.
Frequently Asked Questions (Painted Lady (Cosmopolitan))
Direct answers to the most common rearing, diet, and metamorphosis questions
Master Research Guides for Painted Lady (Cosmopolitan)
Rearing protocols, lifecycle stages, and field husbandry
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Butterfly Emerged With Crumpled Wings That Won’t Expand: Golden Hour Emergency Care, Causes & Sanctuary Life
Why Is My Monarch Caterpillar Leaking Green Liquid? (Regurgitation vs. Cuticle Rupture vs. Flacherie)
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