1, Curcuma longa, also known as Baodingxiang, Yujin, Miming, Dioscorea zingiberensis, etc., are perennial herbs of Musaceae and Curcuma, with well-developed rhizomes, stout roots, plant height of 1- 1.5m, terminal swelling in the form of tuberous roots, short and tapering leaves with oblong or oval shapes.

2. Turmeric is produced in China, Taiwan Province, Fujian, Guangdong, Guangxi, Yunnan, Tibet and other provinces, and is widely cultivated in East Asia and Southeast Asia. Jiang Huang likes a warm and humid climate, especially an environment with abundant sunshine and rainfall. He is afraid of cold and frost, drought and water accumulation.

3. The rhizome of Curcuma longa is irregular oval, cylindrical or spindle-shaped, with dark yellow and rough surface, often curved, with shriveled texture and obvious links on the outside, round branch marks and fibrous root marks, obvious ring marks on the inner cortex, dotted vascular bundles, solid quality, hard to break, golden yellow to brownish yellow cross-section, horny and waxy luster.