No, I don't think so, as many people have raised Monarch caterpillar successfully with curassavica there. The choice is yours, but more important is whether plants are safe (not sprayed with pesticides) for the caterpillars. Almost all of the milkweed plants sold in nurseries here have been sprayed, often with systemic pesticides that remain in the plants for very long periods of time. I grow both A. curassavica and two kinds of milkweed native to Texas. Mostly I grow them from seed or cuttings. But sometimes I do buy A. curassavica from a nursery I trust more.
