Double orange hibiscus features bold orange round flowers at the ends of the branches from mid-summer to early fall. Its glossy pointy leaves remain dark green in color throughout the year. The plants can grow to 15 feet tall in frost-free areas. Flowers may be up to 6 inches in diameter.hibiscus is used for treating loss of appetite, colds, heart and nerve diseases, upper respiratory tract pain and swelling (inflammation), fluid retention, stomach irritation, and disorders of circulation; for dissolving phlegm; as a gentle laxative; and as a diuretic to increase urine output. The plant comes in a healthy, well-rooted condition, ready for transplanting into your favorite garden bed, planter, or decorative pot. Its vibrant leaves and sturdy stem ensure long-term growth and easy maintenance, requiring only basic care such as regular watering, occasional pruning, and periodic feeding with organic fertilizer.