@gilbertwood And look what I found ... Rose of Sharon (Hibiscus syriacus) and Chinese hibiscus (Hibiscus rosa-sinensis) are cousins. Both are members of the mallow family, a large group of several hundred different plant species. While the flowers of rose of Sharon and Chinese hibiscus look similar, these plants are from different climates; one is temperate and the other tropical. So they thrive in different places.