Experts and BHG readers answer.
Hibiscus and other perrenials
There are many different garden plans to choose from at www.bhg.com. Perhaps you need a foliage backdrop for the coneflowers; try some natural garsses for texture between them and the hibiscus. As for plants that bloom at the same time, and like the same rich, well-drained soil conditions with regular water, try out some annuals like zinnias.