The gas tax is just one example of an excise tax. Unlike retail sales taxes, which are clear to consumers, excise taxes are imposed on producers. As a result, the final cost of excise taxes is often hidden from consumers. These taxes lower consumption of the taxed product and increase consumption of other products.
An evergreen shrub with abundant flowers, hibiscus is most often planted as a shrub in outdoor landscaping. It is possible to grow hibiscus in containers indoors if you have a spot that receives full sunlight for at least six to eight hours a day.
Assuming that you are referring to the common hibiscus, Hibiscus rosa-sinensis, they are perennials, because they are viable year after year. Annuals are plants that grow, flower, and die in the space of one year. Of course, hibiscus are also tropical plants, so if you grow them in a northern area (where winter temps fall below freezing,) they will be killed by the cold, so you will have to get new bushes every year - thus, you might think they are annuals.