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. (Xinhua/Zhang Xiuke)

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. (Xinhua/Zhang Xiuke)

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. (Xinhua/Zhang Xiuke)

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. (Xinhua/Zhang Xiuke)

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. (Xinhua/Zhang Xiuke)

A farmer conveys 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. (Xinhua/Zhang Xiuke)

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. (Xinhua/Zhang Xiuke)