Workers pick up West Lake Longjing tea leaves at a tea garden in Meijiawu Village of Hangzhou, capital of east China's Zhejiang Province, March 21, 2016. As temperature rises, the busy picking season for the West Lake Longjing tea, or literally called Dragon Well tea, a variety of pan-fried green tea from Hangzhou, has arrived. (Xinhua/Xu Yu)

Tea grower Zhu Aigen picks up West Lake Longjing tea leaves at her own tea garden in Meijiawu Village of Hangzhou, capital of east China's Zhejiang Province, March 21, 2016. As temperature rises, the busy picking season for the West Lake Longjing tea, or literally called Dragon Well tea, a variety of pan-fried green tea from Hangzhou, has arrived. (Xinhua/Xu Yu)

Workers pick up West Lake Longjing tea leaves at a tea garden in Meijiawu Village of Hangzhou, capital of east China's Zhejiang Province, March 21, 2016. As temperature rises, the busy picking season for the West Lake Longjing tea, or literally called Dragon Well tea, a variety of pan-fried green tea from Hangzhou, has arrived. (Xinhua/Xu Yu)

Tea grower Zhu Aigen shows West Lake Longjing tea leaves at her own tea garden in Meijiawu Village of Hangzhou, capital of east China's Zhejiang Province, March 21, 2016. As temperature rises, the busy picking season for the West Lake Longjing tea, or literally called Dragon Well tea, a variety of pan-fried green tea from Hangzhou, has arrived. (Xinhua/Xu Yu)