The Old Rule About Spring and Autumn Tea, Tested Against 266 Cups

Spring for the liquor, autumn for the scent

Anxi's tea trade has a settled answer for whether spring or autumn Tieguanyin is the better buy: neither, because they are not competing at the same thing. Chun shui, qiu xiang, spring water, autumn fragrance. Spring tea is supposed to fill the mouth; autumn tea is supposed to fill the room. The line is common enough in Anxi that growers state it as fact, not marketing (Huayuan Tea³; Zhihu²).

In August 2025, six researchers at Fujian Agriculture and Forestry University, one of them based at its Anxi College of Tea Science, ran gas chromatography mass spectrometry, a method that identifies compounds by weight as they evaporate off the leaf, over 266 finished Tieguanyin samples to see whether the old rule holds up in the lab (Zheng et al., Plants, 2025¹). It does, and it does not, in almost equal measure.

What the trade says, and roughly when

The reasoning behind the saying is agronomic, not poetic. Spring leaf comes off the bush after a full winter of dormancy, plucked from early to mid May, and the trade credits that rest period with a fuller-bodied liquor. Autumn leaf is picked around early October, after the growing season's widest swing between hot days and cool nights, which the trade credits with the sharper aroma (Wanling Tea House⁴). Neither harvest is "the" Tieguanyin crop. Both are sold, both are named for what they are supposed to be good at, and a serious Anxi buyer is expected to know which one they are choosing and why.

266 cups under the glass

Zheng and colleagues found that autumn samples did score slightly higher for aroma quality than spring samples, and carried higher overall concentrations of the compounds that evaporate off brewed leaf. On direction, the old rule wins. But the specific chemistry that a taster would call classically floral tells a different story: linalool and its related oxides, the terpene family most tied to a "tea-like" flowery character, actually ran higher in the spring samples, not the autumn ones. The saying gets the outcome right and the reason wrong, or at least incomplete: autumn's edge on the scoreboard is not coming from more of the compound the folk explanation would nominate first.

It is also a small edge. A principal-component analysis of the full compound profile found the spring and autumn samples overlapping considerably rather than separating into two clean clusters, and a second, sharper statistical model could pull the two seasons apart only in the lightly oxidized, lightly roasted style of Tieguanyin. Run the same test on the heavier, traditionally roasted style, and the seasonal signal could not be separated out at all. The paper's own count: of the volatile compounds that reliably tell a spring sample from an autumn one, only about one in five actually moved the aroma quality score. Season leaves a real fingerprint on the chemistry. It leaves a faint one on the cup.

What actually decides the cup

The detail about roast is the one worth carrying to a next purchase. If a strong roast can erase a season's chemical signature entirely, roast is doing more work on the finished tea's aroma than the month the leaf was picked in, a claim the study's own statistics back rather than merely suggest. How that roast is built, and how far a maker chooses to push it, sits downstream of the same withering and oxidation choices that separate a green, floral Tieguanyin from a dark, mineral one. Season is one input among several the maker controls after the leaf is already in hand: pluck standard, withering time, how hard the leaf is shaken to bruise its edges, and how long the roast runs.

None of this retires chun shui qiu xiang. Autumn Tieguanyin really did out-score spring on aroma in the one study built to test it, and the trade's read on which season leans which way is not folklore dressed up as fact. But a buyer reaching for an autumn bag on the strength of the fragrance story, expecting more of the specific floral note the saying implies, is reaching for the wrong lever. That note runs stronger in spring. What actually decided the cup was never printed on the season line at all; it was the roast the maker chose after the leaf was already in hand.