Hibiscus require at least 1 inch of rain (or equivalent watering) each week. They like to be constantly moist, but not wet. Feed twice a month during the growing season and prune as necessary to control plant size and cut back errant branches.
Cut branches back to just above a side shoot. Hibiscus are sensitive to cold and should be protected when temperatures dip into the 30s, container-grown plants should be brought indoors. Check plants periodically for pests such as aphids, white flies, and mealy bugs. Use a horticultural oil or insecticidal soap to control these pests.
Plant in spring, summer, or fall, spacing plants 3 to 6 feet apart. Dig a hole only as deep as the root ball and 2 to 3 times as wide. If your soil is in very poor condition, amend the soil you've removed from the hole with a small amount of compost.
Otherwise don't amend it at all. Carefully remove the plant from the container and set it in the hole. Fill the hole half full with soil, then water it well to settle the soil and eliminate air pockets.
Hibiscus are large shrubs or small trees that produce huge, colorful, trumpet-shaped flowers over a long season. Other common names include Chinese hibiscus and tropical hibiscus.