Longjing 龙井 is grown in Hangzhou, Zhejiang, which literally translates to "dragon well," Longjing tea was granted the status of imperial tea, in the Qing dynasty by the Kangxi Emperor.
Longjing tea tastes sweet, mellow, and rounded.
Pre-Qingming Longjing tea requires it to be produced from the first spring shoots prior to the Qingming Festival (Chinese farming calendar) on the 5th of April each year. There will usually be seasonal rain for a few days during the Qingming Festival.
Indeed, after the rain, the temperature heats up, which accelerates the growth of the tea plant. When the tea bud gets too big, it starts to lose complexity in the brewed flavor, therefore, Pre-Qingming tea is considered better.