The Floral grade hibiscus are grown using different techniques to keep them more compact with darker glossy foliage. This treatment will last most of the summer. By the end of the season they will be about twice the size of when your bought them to start.
Hibiscus is the most tropical of all the plants that we can use to make believe we have escaped to the islands in our own back yard and enjoy all summer long until the first frost next winter. Fertilize often and liberally through out the summer for peak performance.