Quick answer: 3 monarch host plants are native to Iowa, 3 with a live listing as of 16 Sep 2026.
3 species
- Butterflyweed Asclepias tuberosa · 37 states
- Swamp milkweed Asclepias incarnata · 25 states
- Whorled milkweed Asclepias verticillata · 6 states
Quick answer: 3 monarch host plants are native to Iowa, 3 with a live listing as of 16 Sep 2026.