Guest Post: Making sense of China’s Tea Harvest
In China the tea plant can be harvested anywhere from once to as many as 6 or 7 times per year. In addition, the first harvest- the first flush in Indian nomenclature- can occur any time from mid-February to end of May. Let us look at some of the factors that determine when tea leaves are harvested.
Where the plant is grown will have a big impact on when it can be harvested. This is dependent on a combination of these factors:
You don’t need to be a botanist to know that plants need sunlight to grow. The amount of sunlight has a positive correlation to when the leaves may be harvested. Hence in high elevations with mist and the presence of natural forests, the plants tend to bloom later.
One of the major factors which affects the different harvest times across regions in China is the heat. Typically, the plant goes into hibernation at temperatures of 10°C and below. Hence apart from the southernmost regions of China teas are not harvested during winter.
Then rainfall comes into play. To facilitate the growth of the plant, rainfall amounts in excess of 100 mm per month are required with an annual rainfall of 1,500 mm being ideal for the plant.
Hence, putting all these factors together, it is useful to view China in terms of its major tea growing regions.
Presently the convention is to split China into the following 4 tea growing regions:
- Jiangnan (South of the Yangtze river)
- Jiangbei (North of the Yangtze river)
- Huanan (South China)
- Xinan (South West China)
Jiangnan is the biggest tea producing region in China with more than half of China’s tea being grown in this region which spans Zhejiang, Jiangxi, part of Anhui and Hunan. Because of its size, Jiangnan is often used as a ‘benchmark’ for season markers- something that we will get to later.
Jiangbei in contrast is the smallest tea producing region in China with Henan, Shandong and northern Anhui being the major provinces. As it represents the northernmost regions in China, it is also the latest and harvest times can commence sometime in late April, even for tender green leaves.
Huanan- which spans Guangdong, Fujian, Taiwan, Guangxi and Hainan- and Xinan- which encompasses Yunnan, Sichuan and Guizhou- have typically tropical to sub-tropical climates provide an environment for the trees to grow for at least 10 months out of the entire year. Its temperate seasonal changes result in the earliest harvest seasons- e.g. mid Feb for Yunnan- of the entire country.
The cultivar or sub-breed of the Camellia Sinensis plant also plays a part in when the tea can be harvested.
Briefly, cultivars can be classified into 3 categories:
- Early bloomers: cultivars that reach 1 bud to 3 leaf ratio in spring with an accumulate active temperature below 400°C
- Mid-bloomers: cultivars that reach 1 bud to 3 leaf ration in spring with an accumulated active temperature between 400°C to 500°C
- Late-bloomers: cultivars that reach 1 bud to 3 leaf ratio in spring with an accumulated active temperature above 500°C
To put it into perspective, take the example of Tieguanyin and Huang Jin Gui which are grown from the Tieguanyin aka Weizhong cultivar and Huang Jin Gui aka Huangdan cultivar. Though both are grown in Anxi, southern Fujian, the Huang Jin Gui is an early bloomer and can be
harvested from early April while Tieguanyin is typically harvested from end April to May.
Category of Tea
The category and indeed variety of tea also affects when it is harvested. In general, the earlier the harvest for green tea, the more tender it is and hence by the same token, the higher its value. This is why the convention is to use Pre-Qing Ming (teas harvested on or prior to 5th April) and Pre-Harvest Rain (teas harvested on or prior to 20th April) to denote higher quality teas. However, these dates are reflective of Jiangnan tea harvest. Pre-Qing Ming, you would be hard-pressed to find any Jiangbei trees ready for harvest while Huanan and Xinan teas would be pretty matured by then. *For further information on this subject you can read a post I wrote on Pre-Qing Ming teas*
Typically oolong teas are harvested at 1 bud to 3-4 leaves ratios while black teas are harvested at 1 bud to 2 leaves ratios. Naturally this is a generalization as there are black teas made from 1 bud to 1 leaf ratios for example. Hence, when the tea is harvested also depends on the bud to leaf ratio desired.
Apart from the above main factors, man-made factors such as fertilization and artificial provision of heat and other natural nutrients could speed up the harvest of the tea.
Information was sourced from the following publications:
- Ming You Cha Ye- Shen Chan Yu Jia Gong Ji Shu by Luo Yao Ping published in Jan 2006 by Zhong Guo Nong Ye Chu Ban Se
- Cha Xue Gai Lun by Zhou Ju Gen and Zhu Yong Xin published in Aug 2007 by Zhong Guo Zhong Yi Yao Chu Ban Se
- Zhong Guo Cha Jing 2011 Revision by Chen Zong Mao and Yang Ya Jun published in Oct 2011 by Shanghai Wen Hua Chu Ban Se
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