The Welfare of Monarch Caterpillars

Monarch caterpillar survival depends on milkweed availability — its loss is a welfare and conservation crisis.

Key Facts

Monarch caterpillars eat exclusively milkweed — no milkweed means no monarchs
Milkweed has declined by over 80% in Midwestern agricultural areas since the 1990s
Glyphosate-tolerant crop systems eliminate milkweed from field edges where it historically grew
Citizen milkweed planting programs are attempting to restore corridor habitat

Welfare Considerations

Monarch caterpillar welfare depends entirely on milkweed availability. The loss of this single food plant from agricultural landscapes through herbicide use is the primary driver of monarch decline. Caterpillars that hatch without adequate milkweed starve. Whether this constitutes animal suffering in a morally relevant sense is uncertain given insect sentience questions, but the ecological cascade from monarch loss affects many animals that clearly are sentient — predators and scavengers that depend on insect abundance. Milkweed planting is one of the most accessible wildlife welfare actions for individual gardeners.

What You Can Do

Plant native milkweed species in your garden appropriate to your region
Avoid all pesticide use on milkweed and nearby flowering plants
Support milkweed corridor planting along roadsides and agricultural margins
Donate to organizations funding monarch habitat restoration programs