A farmer dries fresh dendrobium noble flowers in Pingtan Village in Chishui, southwest China's Guizhou Province, May 4, 2019. Dendrobium noble is a member of the family Orchidaceae. It is one of herbs used in traditional Chinese medicine, known as Shi Hu. (Xinhua/Wang Changyu)

Farmers sort fresh dendrobium noble flowers in Pingtan Village in Chishui, southwest China's Guizhou Province, May 4, 2019. Dendrobium noble is a member of the family Orchidaceae. It is one of herbs used in traditional Chinese medicine, known as Shi Hu. (Xinhua/Wang Changyu)

A farmer picks dendrobium noble flowers in Pingtan Village in Chishui, southwest China's Guizhou Province, May 4, 2019. Dendrobium noble is a member of the family Orchidaceae. It is one of herbs used in traditional Chinese medicine, known as Shi Hu. (Xinhua/Wang Changyu)

A farmer dries fresh dendrobium noble flowers in Pingtan Village in Chishui, southwest China's Guizhou Province, May 4, 2019. Dendrobium noble is a member of the family Orchidaceae. It is one of herbs used in traditional Chinese medicine, known as Shi Hu. (Xinhua/Wang Changyu)

A farmer dries fresh dendrobium noble flowers in Pingtan Village in Chishui, southwest China's Guizhou Province, May 4, 2019. Dendrobium noble is a member of the family Orchidaceae. It is one of herbs used in traditional Chinese medicine, known as Shi Hu. (Xinhua/Wang Changyu)