THE WORLD TEA HARVEST
SEASONS

TABLE OF CONTENTS

Introduction: Why Harvest Windows Rule Everything

In the tea trade, timing is not everything—but it is most things. A Darjeeling first flush plucked in late March will command four times the price of the same garden's summer leaf; a pre-Qingming Longjing picked on 2 April may sell out within days, while the morphologically identical bush two weeks later sits unsold. For buyers, blenders, café owners and policy analysts, understanding the world's harvest calendar is not an exercise in romanticism. It is the foundation of procurement strategy, inventory planning, and pricing.

Unlike annual crops—wheat, rice, coffee—tea is a perennial that can be plucked year-round in equatorial zones or harvested in discrete, highly seasonal windows at higher latitudes and elevations. These windows are driven by dormancy, monsoon, day-length, altitude, and cultivar, and each imparts a distinctive biochemical signature: amino-acid-rich spring tips, catechin-heavy summer leaf, mellow autumnal character. The result is a global jigsaw of overlapping and complementary seasons that profoundly shape quality, availability and market dynamics.

This handbook maps that jigsaw month by month, region by region. It explains why certain windows exist, what biochemical and sensory shifts occur, and how buyers should time orders, manage cash flow, and communicate seasonal value to customers. The science is rigorous, the data grounded in agronomic reality, and the guidance commercially actionable. Whether you are a London buyer negotiating pre-shipment terms for Darjeeling, a café owner choosing which Japanese sencha to feature, or an analyst forecasting Kenyan CTC supply, this is your reference.

We begin with the fundamentals of seasonality and biochemistry, then move through the calendar—India's flush system, China's spring mania, Japan's shincha ritual, the year-round equatorial belt, and the monsoon-modulated complexity of Sri Lanka. Each section is built for decision-making: tables of harvest windows, quality drivers, and price relativities; expert tips on contracting and freshness; and method cards for evaluating seasonal lots. The free Lite edition covers the essentials; the Complete edition adds the deep, region-specific intelligence that separates competent buying from strategic advantage.

If you have ever wondered why a certain tea costs what it does, arrives when it does, or tastes the way it does, the answer almost always begins with the harvest window. This handbook gives you that answer—and the tools to act on it.

1. The Biochemistry of Seasonality: Why Timing Matters

Tea quality is not a mystical property bestowed by terroir alone; it is a biochemical outcome shaped by photosynthesis, nitrogen metabolism, phenolic synthesis, and stress response. The when of plucking determines the what of chemistry, and chemistry determines flavour, aroma, mouthfeel, and commercial value.

The spring advantage: amino acids and arrested development

In temperate and high-elevation tea zones (Darjeeling, Japan, much of China, northern Vietnam), the bush enters winter dormancy. Photosynthesis slows or halts; the plant reallocates resources to roots and stem, accumulating nitrogen compounds—principally theanine and other free amino acids—in anticipation of spring flush. When temperatures rise and day-length increases, the dormant buds break. Because leaf expansion is initially faster than photosynthetic capacity, these early shoots are rich in amino acids and relatively low in catechins and caffeine. The result: a sweet, umami-rich, low-astringency profile that fetches premium prices.

As the season progresses, photosynthesis catches up. Catechin synthesis (especially the bitter, astringent EGCG) accelerates in response to UV exposure and temperature. By mid-summer, the amino-acid-to-polyphenol ratio has inverted. Summer and rain-flush teas are typically more astringent, less sweet, and—commercially—less prized, though they remain essential for volume blending and CTC production.

Equatorial plucking: the absence of dormancy

In equatorial zones (Kenya, southern India, lowland Sri Lanka, parts of Yunnan), the bush does not truly rest. Plucking is continuous, driven by rainfall rather than temperature. There is no spring amino-acid surge; instead, quality is modulated by elevation, clone, and plucking frequency. High-altitude Kenyan purple-leaf clones (TRFK 306, for example) can produce nuanced, floral teas year-round if plucked selectively. The trade-off: no single "peak" window means no built-in scarcity premium, and buyers must rely on estate reputation and sensory evaluation rather than calendar cues.

2. Understanding Flush Systems and Harvest Nomenclature

Before diving into the calendar, it is essential to decode the nomenclature. Terms like "first flush", "shincha", "pre-Qingming", and "monsoon flush" are not interchangeable; each reflects a distinct agro-climatic system and carries different quality and pricing implications.

The Indian flush model

In Darjeeling, Assam, and the Nilgiris, the year is divided into discrete flushes—periods of vegetative growth following dormancy or pruning. First flush (March–April) follows winter dormancy and is prized for delicacy and floral character. Second flush (May–June) arrives after the pre-monsoon rains; the leaf is more mature, muscatel notes emerge (especially in Darjeeling), and body increases. Monsoon/rain flush (July–September) produces high volumes of lower-quality leaf used for blending and CTC. Autumnal flush (October–November) offers a middle ground: less intense than second flush but more nuanced than monsoon, with mellow, rounded character.

Critically, "flush" is not just a harvest round—it is a biochemical state. A garden may pluck continuously through a flush, but the window itself is defined by the plant's phenological stage.

Chinese solar-term precision

In China, spring green teas (Longjing, Biluochun, Huangshan Maofeng) are often dated to traditional solar terms. Pre-Qingming (Ming Qian, 明前) teas are harvested before the Qingming Festival (around 5 April); they are the most expensive, as the weather is still cool and growth slow, yielding tiny, tender buds. Pre-Grain Rain (Yu Qian, 雨前) teas are picked before Guyu (around 20 April); they are slightly larger, more robust, still premium but less scarce. Post-Guyu teas are cheaper and less sought-after, though perfectly serviceable.

This solar-term framework is less applicable to oolongs and black teas, which are often harvested later and across multiple seasons. Wuyi oolongs, for example, may be picked in late April through June; Anxi Tieguanyin has distinct spring (April–May) and autumn (September–October) seasons, with autumn often preferred by connoisseurs.

Japan's ichibancha and beyond

Japanese tea is counted in harvests: ichibancha (一番茶, first tea, April–May) is spring harvest, marketed as shincha (new tea) when sold fresh; nibancha (二番茶, second tea, June–July) and sanbancha (三番茶, third tea, late July–August) follow. Ichibancha dominates quality production; nibancha is used for mid-tier sencha and blending; sanbancha is largely industrial or exported as commodity tea. Bancha (coarse tea) is a grade, not a season, though it often incorporates later-harvest or larger leaf.

• First flush / Ming Qian / ichibancha: spring, post-dormancy, amino-acid-rich, premium pricing.
• Second flush / Yu Qian / nibancha: late spring to early summer, more body, moderate pricing.
• Monsoon / rain flush: high volume, lower quality (India, Sri Lanka).
• Autumnal flush: mellow, balanced, often undervalued (India, China oolongs).
• Year-round plucking: equatorial; quality determined by clone, elevation, and estate management, not calendar.

3. The Global Harvest Calendar at a Glance

The following table maps the major harvest windows across the world's key production regions. It is a buyer's quick-reference: when to expect new-crop offers, when to lock in contracts, and when to anticipate price and quality shifts. Dates are approximate and vary by ±1–3 weeks depending on weather, elevation, and cultivar.

This calendar is not static. Climate variability—earlier springs in Darjeeling, erratic monsoons in Assam, shifting rainfall in Kenya—is compressing or shifting windows. In 2025, Darjeeling first flush arrived nearly two weeks early in some gardens; buyers who waited for traditional timing missed the best lots. Flexibility and close communication with estates or agents are now essential.

4. Darjeeling: The Flush Hierarchy and Buyer Strategy

Darjeeling is the archetype of flush-driven value. Its 87 registered estates produce roughly 8,000–10,000 tonnes per year, but first flush accounts for only 15–20% of volume yet 40–50% of revenue. Understanding the flush cycle here is not academic; it is the difference between profitable inventory and dead stock.

First flush: scarcity and speculation

Darjeeling first flush begins in mid-to-late March as day temperatures climb above 15 °C and dormant buds break. The earliest gardens (Castleton, Glenburn, Thurbo) may invoice by the last week of March; most peak in early-to-mid April. The biochemistry is classic spring: high theanine, low catechin, minimal oxidation even in "black" tea processing, resulting in a pale liquor, floral-astringent profile, and champagne-like brightness.

Prices are volatile. A top first-flush invoice from Castleton or Arya may open at ₹8,000–15,000/kg (roughly £75–140/kg) at Kolkata auction, but some rare micro-lots have touched ₹40,000/kg. For export buyers, FOB Kolkata typically adds 20–30% to auction hammer price once logistics, export levies, and agent margins are included. The window is narrow—four to six weeks—so demand concentrates intensely, and buyers compete not just on price but on pre-booking relationships.

Second flush: muscatel and margin

Second flush (May–June) is Darjeeling's commercial workhorse. Pre-monsoon showers (typically late April) trigger vigorous growth; the leaf is larger, more mature, and processed with longer oxidation. The signature muscatel note—a grape-like, honeyed sweetness—emerges, especially in clonal teas from estates like Castleton, Margaret's Hope, and Thurbo. Liquor is amber-to-copper, body fuller, astringency moderate.

Prices are lower than first flush—₹1,500–6,000/kg at auction (£15–60/kg FOB)—but volumes are 2–3× higher, and the tea is more forgiving in blending and retail. For buyers, second flush offers the best quality-to-price ratio and is the backbone of year-round Darjeeling offerings. It also ships well; the higher catechin content means better shelf stability.

Monsoon and autumnal: the overlooked opportunities

Monsoon flush (July–September) is rarely exported as whole-leaf; it is bulked for domestic CTC or low-grade blends. Rains dilute flavour, leaf grows fast and coarse, and quality is pedestrian. Auction prices drop to ₹400–1,200/kg. Autumnal flush (October–November), however, is undervalued. Post-monsoon, temperatures moderate, leaf matures slowly, and oxidation can be carefully controlled. The result is a mellow, rounded, slightly nutty tea with good body and low astringency—ideal for afternoon or evening service, and priced at ₹800–2,500/kg (£8–25/kg FOB). Savvy buyers use autumnal as a house Darjeeling, reserving first flush for limited releases.