Swan Plant (Gomphocarpus physocarpus): The Butterfly Host with Balloon Pods

The swan plant, also called balloon plant, cotton-bush, or hairy balls, is a fast-growing shrub that serves as a host plant for monarch butterflies. Its unique feature is the inflated, lime-green, hairy seed pods that resemble swans or balloons. Native to Africa, Gomphocarpus physocarpus produces small, white, star-shaped flowers in clusters.

Cultivation and Ecology

Full sun, well-drained soil. Drought-tolerant once established. It self-sows prolifically. In cooler zones, grow as an annual. Monarch caterpillars feed exclusively on its leaves. The pods are decorative in arrangements.

Garden Uses

Essential for butterfly gardens. Plant in groups to support caterpillars. The pods add whimsy to borders and cut flower arrangements. All parts are toxic if ingested; sap may irritate skin.

Taxonomic Information