Vivid orange-red flat-topped clusters that monarchs and swallowtails cannot resist. Drought-proof once established.
Toxic to cats and dogs. The sap carries heart-affecting compounds, so a substantial ingestion is worth a vet call rather than a wait and see.
The milky sap irritates skin and eyes. Wear gloves to cut it, and keep your hands away from your face until you have washed them.
For gardeners who like to stay ahead.