Hibiscus are sun-loving plants, but they can’t handle too much direct sunlight without getting sunburned. Choose a location in your garden that gets 4-6 hours of direct sunlight a day, and ambient sunlight for the rest of the time. Typically this would be on the west or south side of your garden. The hibiscus can be shaded by larger trees if necessary, but will need space to spread out, as they may eventually take up two or three times the space of their original size.
Some hibiscus plants have lived over 40 years, meaning that you could be dealing with a very large bush. Make sure you find a permanent location for your hibiscus to start. Try to find a location that has good drainage; water-pooling will drown out your hibiscus. On the other hand, avoid a location that is primarily sand. Make sure to test the soil’s drainage and permeability before planting. To do this, dig a hole, pour a gallon of water in it, if the water doesn't disappear within an hour, then amend the soil to deal with the extra clay in it. If the water drains too quickly when you pour it in, then consider adding come clay.