Houttuynia cordata Thunb is mainly distributed in the central, southeastern and southwestern provinces south of the Yangtze River Basin in China, especially in Sichuan, Hubei, Zhejiang, Fujian, Guangxi and Guizhou provinces. Ya 'an, Sichuan is one of the main producing areas of Houttuynia cordata in China.

Houttuynia cordata generally grows in forests, roadsides, ridges and ditches at an altitude of 300 ~ 2600 m, and likes warm and humid environment. When the soil temperature reaches about 12℃, the seedlings begin to emerge, and the suitable temperature is 15 ~ 20℃ in the growing period and 20 ~ 25℃ in the mature period of underground stems.

Houttuynia cordata Thunb is also cold-tolerant, and can safely overwinter when the temperature drops to-15℃. Houttuynia cordata Thunb does not have strict requirements on light and soil, and mostly grows in slightly acidic wetlands and sewers.

Extended data:

Functions of Houttuynia cordata Thunb:

Yellow oily substance extracted from Houttuynia cordata Thunb. It has inhibitory effect on a variety of microorganisms (especially yeasts and molds), and has obvious inhibitory effect on hemolytic streptococcus, staphylococcus aureus, influenza Bacillus, streptococcus and pneumococcus.

It also has effects on Escherichia coli, Shigella dysenteriae and Salmonella typhi. The synthetic adduct of sodium bisulfite of decanoyl acetaldehyde is called synthetic houttuynia cordata Thunb. Sodium bisulfite adduct of dodecanal is called rhodopsin, which has obvious inhibitory effect on many bacteria in vitro and in vivo.

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