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.