Farmers check beehives in Jingxing County, north China's Hebei Province, June 10, 2019. Farmers are busy collecting honey in Jingxing County as the vitex, an important honey plant, starts to produce nectar in early June. (Photo: Xinhua)

Farmers convey beehives in Jingxing County, north China's Hebei Province, June 10, 2019. Farmers are busy collecting honey in Jingxing County as the vitex, an important honey plant, starts to produce nectar in early June. (Photo: Xinhua)

A farmer checks a beehive in Jingxing County, north China's Hebei Province, June 10, 2019. Farmers are busy collecting honey in Jingxing County as the vitex, an important honey plant, starts to produce nectar in early June. (Photo: Xinhua)

A farmer checks beehives in Jingxing County, north China's Hebei Province, June 10, 2019. Farmers are busy collecting honey in Jingxing County as the vitex, an important honey plant, starts to produce nectar in early June. (Photo: Xinhua)

Farmers convey beehives in Jingxing County, north China's Hebei Province, June 10, 2019. Farmers are busy collecting honey in Jingxing County as the vitex, an important honey plant, starts to produce nectar in early June. (Photo: Xinhua)