Monarch Caterpillar on Common Milkweed

A monarch caterpillar feeds on a common milkweed plant growing among native prairie vegetation. Much of the plant’s foliage has already been eaten, a visible sign that the milkweed is actively supporting, or has recently supported, monarch caterpillars. Milkweed is the essential host plant for monarch larvae, and this type of feeding damage can provide evidence of monarch activity even when caterpillars are no longer present.

Image Uploaded September 28, 2026

A monarch caterpillar feeds on a common milkweed plant growing within an established patch of prairie vegetation. Much of the milkweed’s foliage has already been consumed, leaving a relatively bare stem with clusters of leaves remaining near the top. This type of feeding damage is a useful sign of monarch activity, showing that a milkweed plant is supporting, or has recently supported, monarch caterpillars even when the insects themselves may be difficult to find.

Native warm-season grasses surround the milkweed, including what appears to be big bluestem and possibly Indiangrass. These tall prairie grasses provide structure around the milkweed while contributing to a more diverse habitat than milkweed growing alone. By late summer, their tall stems and developing seed heads create layers of vegetation that can provide shelter for insects and other wildlife while the milkweed continues serving its specialized role as a monarch host plant.

The ground around the plant also shows a noticeable accumulation of thatch from previous seasons of grass growth. This layer of dead vegetation is a normal part of an established prairie, although its density can change as the site matures and is managed through mowing, prescribed fire, grazing, or natural decomposition. Together, the milkweed, monarch caterpillar, native grasses, and accumulated plant material show several stages of a developing prairie ecosystem occurring in the same small area.

Source: Nick Niesen