The short answer
Four seasons oolong is a lightly oxidized, intensely floral Taiwanese oolong made from a hardy modern cultivar called Si Ji Chun, a name that translates as "four season spring." Unlike the famous high-mountain teas of the island, four seasons oolong thrives in warmer, lower ground and can be picked again and again through the year, which is exactly why it became Taiwan's everyday cup: fragrant, approachable and endlessly drinkable.
If you have ever brewed a green, gardenia-scented rolled oolong and wondered why it tasted like spring even though it was picked in autumn, there is a good chance it was four seasons oolong. This guide covers where it grows, the cultivar's short but interesting history, how it is processed, what it tastes like, and how it stacks up against its more celebrated neighbors.
What is four seasons oolong?
The tea takes its name directly from its plant. Si Ji Chun is a specific tea cultivar (a cloned variety of Camellia sinensis), and it is unusually vigorous: it buds early, grows fast and yields a crop in every season, with each harvest keeping much of the fresh, floral character usually associated with a spring pluck. That trait is where the poetic name comes from, and English-language sellers sometimes label it siji spring oolong or simply four season spring tea.
In the cup it belongs to the same broad family as Taiwan's other rolled oolongs. If you are new to the category, our overview of what oolong tea actually is explains how partial oxidation places these teas between green and black. Four seasons oolong sits toward the greener, lighter end of that spectrum: oxidation is modest, roasting is usually minimal or absent, and the leaf is rolled into tight little balls that unfurl dramatically in hot water. The result is a tea prized less for depth and more for its immediate, perfumed lift. Because the cultivar carries so much of that aroma in the plant itself, the tea delivers a great deal of fragrance for very little fuss, which is a large part of its charm.
Where it grows: the terroir of a taiwan lowland oolong
Most of Taiwan's most sought-after teas are gaoshan, or high-mountain, oolongs grown above roughly 1,000 meters, where cool nights and frequent mist slow the leaves and concentrate sweetness. Si Ji Chun is the opposite story. It is the classic taiwan lowland oolong, happiest in warmer, lower-elevation gardens where its fast growth and resilience are an advantage rather than a liability.
The heartland is Mingjian Township in Nantou County, in the center of the island. Mingjian's rolling tea land sits at modest elevations commonly cited in the range of a few hundred meters up to around 800, and its warm climate lets growers take multiple harvests a year, often with mechanical harvesting to keep pace. By many accounts Mingjian is one of the most productive tea districts in Taiwan, and its flat-to-gently-sloping fields are well suited to the machine plucking that keeps a fast-growing cultivar economical. This is farming built for volume and consistency, which is a big part of why four seasons oolong is so widely available and so affordable. Nantou is also home to more prestigious names, and you can taste the contrast for yourself against a traditional roasted style like Dong Ding oolong, which comes from the same county but a very different tradition.
Terroir here is less about dramatic altitude and more about warmth, sunshine and the cultivar's own genetics. Because Si Ji Chun packs so much aromatic intensity into the plant itself, even lowland gardens produce a strikingly fragrant tea. That said, growers also plant it at higher elevations and in other regions of Taiwan, where cooler conditions can add a rounder, softer texture and a slightly more restrained perfume. The same cultivar has since spread well beyond Taiwan, and gardens in parts of Southeast Asia now grow it too, though the Taiwanese versions remain the reference point.
A young cultivar with a good origin story
Four seasons oolong is a relative newcomer. By most accounts the cultivar was noticed in the Muzha (Mucha) district near Taipei, when a tea farmer spotted a few unusually fast-growing, vigorous bushes among his plants and propagated them. It is generally described as a natural hybrid rather than a formally bred, numbered variety from a research station, and its exact parentage is uncertain; genetic work has pointed toward a Wuyi-type maternal line with a Qingxin-type pollen parent, but you will see this reported with some variation, so it is best treated as commonly suggested rather than settled fact.
What is not in doubt is why it spread so quickly. Farmers found a plant that produced reliable, good-quality leaf several times a year, with a naturally floral aroma and few demands on the grower. It traveled from Muzha into Mingjian and then across much of the island. In a few short decades it went from a lucky garden discovery to one of Taiwan's most widely planted oolong cultivars and a backbone of its everyday-tea economy. The name itself became a selling point: a tea that captures spring in every season is an easy story to tell, and it happens to be true to the plant's behavior.
Styles, grades and how four seasons oolong is made
Processing follows the familiar Taiwanese rolled-oolong path: withering, a light bruising and partial oxidation, fixing (kill-green) to halt oxidation, then repeated rolling and drying that compresses the leaf into semi-spherical pellets. A few variables create the styles you will encounter:
- Oxidation level. Most four seasons oolong is lightly oxidized, often cited in roughly the 15 to 25 percent range, which preserves its green, floral top notes. Some producers push oxidation a little higher for a rounder, fruitier cup.
- Roast. The signature style is unroasted or very lightly roasted, keeping it bright and aromatic. You will also find deliberately roasted versions with toastier, nuttier notes for drinkers who prefer warmth over florals.
- Harvest and picking. Because it is picked in every season, quality varies by flush and by whether the leaf was hand-plucked or machine-harvested. Spring and winter pickings are generally regarded as the most refined.
- Beyond oolong. The Si Ji Chun cultivar is versatile enough that some makers process it as a floral black tea or use it in scented blends and bubble-tea bases, where its aromatic punch survives milk and ice unusually well.
There is no single official grading ladder, so in practice you judge quality by season, aroma, tightness of the roll and the cleanness of the finish rather than by a label. A tightly rolled, uniform leaf that unfurls into whole, supple pieces is a good sign; dusty broken bits and a flat, papery aroma are not.
How the harvests differ through the year
The cultivar's whole selling point is that it can be plucked in every season, but the seasons are not identical in the cup. Spring leaf tends to be the most aromatic and balanced, with the fullest floral lift. Winter tea, picked as the plant slows in cooler weather, is often prized for a rounder, sweeter, more polished character. Summer harvests, driven by heat and rapid growth, are typically the most robust and the easiest to over-brew into grassiness, and are frequently the leaf that ends up in blends and flavored drinks. Autumn sits somewhere in between, fragrant but usually a touch softer than spring. None of this is a strict rule, and a careful maker can produce a lovely tea from any flush, but it explains why the same garden can offer noticeably different lots across the year.
What four seasons oolong tastes like
The defining feature is aroma. Four seasons oolong is one of the most overtly floral teas Taiwan makes, and tasters reach again and again for the same descriptors: gardenia, lilac, osmanthus, magnolia and hyacinth, sometimes with a hint of ripe stone fruit. The perfume can be so pronounced that first-time drinkers assume the tea has been artificially scented, when in fact it is all cultivar and processing.
On the palate it is light-bodied, smooth and gently sweet, usually with a soft, faintly creamy or milky finish and low astringency when brewed with care. It is refreshing rather than deep, which is precisely its appeal as a daily pour. It rewards attention but forgives inattention, making it a friendly gateway into Taiwanese oolong. Like all true tea it does contain caffeine; oolong generally lands in a moderate range, but the exact amount in your cup will vary with the leaf, the quantity you use and how you brew, so treat any single figure you see quoted as an estimate rather than a fixed fact.
Four seasons oolong at a glance
The table below places four seasons oolong beside three of Taiwan's better-known oolongs so you can see where it fits.
| Tea | Typical origin | Elevation character | Style | Flavor signature |
|---|---|---|---|---|
| Four Seasons (Si Ji Chun) | Mingjian, Nantou and widely across the island | Lowland / warm | Light oxidation, usually unroasted, ball-rolled | Bold gardenia and lilac florals, sweet, light, everyday |
| Alishan | Chiayi high mountains | High mountain (gaoshan) | Light oxidation, ball-rolled | Buttery, creamy, delicate high-mountain sweetness |
| Dong Ding | Lugu, Nantou | Mid elevation | Traditionally roasted, ball-rolled | Roasted, nutty, caramel warmth with floral depth |
| Baozhong (Pouchong) | Wenshan, near Taipei | Lower hills | Very light oxidation, strip-style (not rolled) | Delicate, green, lily-fresh and airy |
How four seasons oolong compares to its neighbors
Four seasons oolong is often the first tea people compare with the island's prestige names, and the differences are instructive. Against Alishan high-mountain oolong, four seasons is more emphatically floral and forward but lacks the cool, buttery elegance and lingering sweetness that thin mountain air gives gaoshan tea; Alishan whispers where four seasons announces itself. Against Dong Ding, the contrast is oxidation and roast: Dong Ding's traditional style trades bright florals for toasty, caramelized warmth, so the two feel like different moods of the same craft.
The closest kinship is with Baozhong (Pouchong), another lower-elevation, very lightly oxidized Taiwanese oolong built around fragrance. The key visual and textural difference is shape: Baozhong is left in loose, twisted strips rather than rolled into balls, which makes it lighter and airier in the cup, while four seasons tends to be punchier and rounder. Both are excellent, approachable introductions to the floral side of Taiwanese tea, and tasting them side by side is one of the clearest ways to understand what rolling does to an oolong. If you enjoy one, the other is a natural next pour.
How to brew it
Four seasons oolong is forgiving, which suits its everyday role, but a little care unlocks its aroma. Rolled oolongs open slowly, so give the pellets room and time. A reliable approach:
- Water: just off the boil, roughly 90 to 95 degrees Celsius (195 to 205 Fahrenheit). Very hot water helps the tight leaf unfurl and lifts the florals.
- Western style: about 2 to 3 grams per 200 ml, steeped 2 to 3 minutes, then re-steeped a little longer.
- Gongfu style: a fuller vessel of leaf with short, repeated infusions of 20 to 40 seconds. This is where the tea shines, giving several fragrant, evolving cups from one measure of leaf.
- Watch the astringency: because it is often machine-harvested, over-steeping can turn it grassy or drying, so err on the shorter side and extend as you go.
For a fuller walkthrough of temperatures, ratios and multiple infusions, see our guide on how to brew oolong tea. As a general rule, if the cup tastes flat, add leaf rather than time; if it tastes sharp, shorten the steep. It also takes well to being brewed strong and chilled for iced tea, which is one reason the cultivar is so popular in cold and blended drinks.
The bottom line on four seasons oolong
Four seasons oolong earns its everyday reputation honestly. It is a young, resilient cultivar that turned Taiwan's warm lowlands into a source of genuinely fragrant, inexpensive tea, and its bold floral character makes it one of the most immediately likable oolongs you can pour. It will not replace a great high-mountain tea for special occasions, but that is not its job. As a daily, dependable, gardenia-scented cup, Si Ji Chun is hard to beat, and it is one of the best places to start if you want to understand what makes Taiwanese oolong so distinctive.