The big picture
Reprocessed tea has no growing region of its own, and its map is one of transformations rather than of land.
The largest point on it is Hengxian in Guangxi, which grows most of the jasmine used in Chinese tea.
The county plants jasmine across roughly 6,700 hectares, and the flowers are picked every afternoon in summer.
Traditional work uses 30 to 40 kilos of flower for every 100 kilos of leaf.
Fuzhou in Fujian was the old centre of scenting, and a few producers there still work the traditional way.
Yunnan appears on the map for a different reason, since it supplies the dark tea that gets compressed and aged.
Menghai in Xishuangbanna is where most of that pressing now happens.
Xinhui in Guangdong supplies the tangerine peel used for gan pu tea, which is filled with Yunnan material.
Guilin sends osmanthus, and Pingyin in Shandong sends rose, both scented into green or red bases.
Each point is a partner in a process rather than a growing area for a single tea.
The base leaf often comes from somewhere else entirely, and it is chosen for how well it absorbs aroma.
So the map has two layers: where the flower or filler grew, and where the tea was actually made.
Reading the map
Read this map by process rather than by place, because the place names describe ingredients, not gardens.
Hengxian is a flower growing district that also makes finished tea, which makes it unusual.
Most producers elsewhere buy flowers from it and do the scenting in their own workshops.
That means a jasmine tea labelled with one district may have been scented in another.
Fuzhou’s name carries more history than volume, since the industry there has shrunk sharply since the 1990s.
Yunnan’s position is different again, since it contributes material and compression rather than scent.
A gan pu tea is half Xinhui and half Yunnan, and neither can be described as the origin alone.
Plot those pairs and the pattern is a set of supply routes rather than a set of clusters.
That is the opposite of the other categories, where a map shows leaf grown and made in one place.
Buyers who expect a terroir story here are looking for something the category does not have.
The useful question is which two regions were combined, and in what proportion.
Why geography matters
Geography matters here through timing rather than through soil, which is a different mechanism entirely.
Jasmine buds open a few hours after dark, and the whole industry is organised around that schedule.
Hengxian’s climate sets the season, and the flowers are picked from June into October.
The picking window runs from about midday to 5pm, and a bud gathered open has already lost part of its scent.
A cool wet summer produces fewer flowers and a shorter window, and prices move accordingly.
Rain during the picking afternoon is the worst case, since wet buds do not open properly.
Soil matters to the peel rather than the tea, and Xinhui’s alluvial ground is what the citrus is grown on.
Peel from that district has visible oil glands and ages differently from peel grown elsewhere.
For Yunnan material, geography works the way it does for dark tea, through altitude and leaf type.
The method grew up where the flowers were, which is why scenting concentrated in the south.
Transport set the rest, since fresh flowers cannot travel far and the base leaf can.
So the geography explains the location of the industry, not the character of the finished cup.
A starting point
Start with the flower or the filler, since that is what you taste beyond the base.
Buy one jasmine tea scented in Hengxian and one made the traditional way in Fuzhou if you can find it.
Compare them at the fourth infusion, where the difference in rounds and ratio becomes obvious.
A tea scented 3 times and one scented 9 are different products, and the price should say which.
Add a gan pu tea next, and check the peel rather than the name, since that is where substitution happens.
Xinhui peel has visible oil glands and a clean citrus smell, and peel from elsewhere usually does not.
Then add altitude, which matters only through the Yunnan base and not through the scenting at all.
Grade comes before region in this category, because the base determines what the aroma has to sit on.
A good base with modest scenting beats a poor base carrying a strong aroma every time.
The GI designations here protect flower and peel growing areas rather than tea gardens.
That makes them useful for the ingredient and irrelevant to the tea underneath it.
Learn the supply route first, and the labels start making sense instead of sounding like origins.