I was looking it up.. It doesn't tell me any zones.. nor does the package I bought them in.. It does say that the butterfly flower is grown in every state.. and is drought tolerant.. I hope that helps!
The Butterfly Flower is a great flower to have & This is milkweed. It attracts Butterflies which will lay their eggs on this plant & use it as larval food. it does best in Full sun. Plant in Dry, sandy soil. It is very Drought resistant. Zones 3-9. It is Larval & a nectar plant for Monarch butterflies. Almost like having a butterfly housing project. It is very beautiful to have planted & to watch the many butterflies fluttering around.Is so amazing to watch them. I also winterize mine with a heated greenhouse during the winter/ cold months.I live in Zone 6. You have a nice auction here.