Zhu Jin (scientific name: Hibiscus rosa-sinensis Linn.): also known as Fusang, Hibiscus hibiscus and Rosa China. Chinese Pinyin: zhujin. Because most of the colors are red, it is commonly known as the big red flower in Lingnan area of China. Evergreen shrub, about 1-3 meters high; Branchlets cylindrical, sparsely stellate pilose. The leaves are broadly ovate or narrowly ovate, and both sides are hairless except for a little thinning along the veins on the back. Flowers are solitary in the axils of upper leaves and often droop; Corolla funnel-shaped, 6- 10 cm in diameter, rose red or reddish, yellowish and other colors, petals obovate, apex round, outside sparsely pilose. Capsule ovoid, about 2.5 cm long, smooth and hairless, with beak. Flowering throughout the year.

Zhu Jin was a popular ornamental plant in ancient times, and its origin was China. Zhu Jin's record appeared in a book "Southern Vegetation" in the Western Jin Dynasty. The flowers are big and colorful, and they bloom all the year round. They are mainly used for garden viewing. It is cultivated all over the world, especially in tropical and subtropical areas.