A villager picks edible rose in Taiping Village of Chang'an District in Xi'an, northwest China's Shaanxi Province, May 16, 2018. Local people have planted edible rose for 40 years. Making rose sauce is a custom for villagers in Taiping. (Xinhua/Shao Rui)

A villager checks ferment of rose sauce in Taiping Village of Chang'an District in Xi'an, northwest China's Shaanxi Province, May 16, 2018. Local people have planted edible rose for 40 years. Making rose sauce is a custom for villagers in Taiping. (Xinhua/Shao Rui)

Villagers dry rose petals in the sun in Taiping Village of Chang'an District in Xi'an, northwest China's Shaanxi Province, May 16, 2018. Local people have planted edible rose for 40 years. Making rose sauce is a custom for villagers in Taiping. (Xinhua/Shao Rui)

A villager picks edible rose in Taiping Village of Chang'an District in Xi'an, northwest China's Shaanxi Province, May 16, 2018. Local people have planted edible rose for 40 years. Making rose sauce is a custom for villagers in Taiping. (Xinhua/Shao Rui)

A villager sorts rose petals in Taiping Village of Chang'an District in Xi'an, northwest China's Shaanxi Province, May 16, 2018. Local people have planted edible rose for 40 years. Making rose sauce is a custom for villagers in Taiping. (Xinhua/Shao Rui)