Tea Guides

Last updated: September 2026

Sandakphu Tea Estate is one of Nepal Hills Tea's four named farm partners, growing at 5,000 to 6,000 ft in Ilam, Nepal. The tea is grown on a certified organic farm, and this one hillside is behind two of our most different teas, Ruby Black Tea and Dark Oolong Tea, both naturally free of bitterness.

If you haven't tried Nepal Hills Tea yet, the easiest place to start is the Tea Sampler Kit ($30 CAD): 10 teas covering all four types, from all four of our farms in Ilam and Taplejung at 5,000 to 6,000 ft, and none of them bitter. If you already know you like bold black tea or a roasted oolong, read on. This article is about Sandakphu, the one farm that grows both.

Where Is Sandakphu Tea Estate, and Why Does the Elevation Matter?

Sandakphu Tea Estate lies at 5,000 to 6,000 ft in Ilam, in the tea-growing hills of eastern Nepal. At that height the tea plant grows more slowly than in the lowlands, which gives the leaf time to build flavour instead of racing to grow bigger. It's the same basic idea that separates a high-altitude wine grape from a mass-market one. Owner Chandra Bhushan Subba and tea maker Santosh Ghale run the estate as a small, hands-on operation rather than an industrial plantation. Every batch is plucked by hand and processed orthodox-style in small lots, which helps the cup come out smooth rather than harsh. That's what Nepal Hills Tea's no bitterness standard rests on, and Sandakphu is one of our two certified organic farms behind it.

Comparative research points the same way. A 2013 planting trial at three South Indian altitudes (Muthumani et al., Journal of Natural Products and Plant Resources) found that black tea grown at the highest of the three sites had a significantly higher flavour index and more theaflavins than genetically identical tea grown lower down. That trial ran at elevations well above Sandakphu's 5,000 to 6,000 ft, and altitude doesn't affect tea chemistry the same way in every study and cultivar. But the general pattern, cooler and slower growth concentrating flavour, is the same thing happening on this hillside.

What Teas Come From Sandakphu Tea Estate, and Why Do They Taste So Different?

Sandakphu Tea Estate grows the leaf for two Nepal Hills teas: Ruby Black Tea and Dark Oolong Tea. Both come from the same bushes on the same hillside, and the difference lies entirely in processing. Ruby Black Tea is fully oxidised and orthodox-rolled, giving a deep ruby-red cup with dark cherry, cocoa, and a velvety feel. Dark Oolong Tea is only about 50% oxidised, which gives it a completely different profile: stone fruit, roasted honey, and a bright acidity that lingers. Same soil and same farmer, yet the two teas taste as if they came from different countries. That's the value of single-origin tea: you can taste what processing actually does to a leaf.

"Ruby Black and Dark Oolong come off the same hillside, but they taste nothing alike," says Bhaskar Dahal, founder of Nepal Hills Tea. "The Ruby Black is all dark cherry and cocoa. The Dark Oolong is stone fruit and roasted honey with a bright finish. Same farmer, same leaf, completely different tea. That's the whole story of Sandakphu."

Research on oolong processing helps explain why Dark Oolong Tea is so smooth at around 50% oxidation. A 2023 Fujian oolong processing trial (Lu et al., Foods) found that lighter, shorter shaking with longer standing time during partial oxidation kept significantly more catechins and gave a measurably lower bitterness and astringency score than heavier, longer shaking of the same cultivar. Sandakphu's Dark Oolong Tea is processed the gentle way, which is part of why it tastes of stone fruit and roasted honey at 50% oxidation, not like an unfinished, astringent halfway point.

Is Sandakphu Tea Estate Certified Organic?

Yes. Both Ruby Black Tea and Dark Oolong Tea are grown on a certified organic farm, Sandakphu Tea Estate in Ilam. The certification belongs to the farm, not to the finished tea, which is why we always describe it that way instead of calling it "certified organic tea." Sandakphu is one of two Nepal Hills farm partners fully certified organic at the grower level; the other is Farmers Tea Co. in Malate, Ilam, which supplies our green and white teas. Of our other two farms, Norling Specialty Tea is in the process of organic certification and Pathibhara Tea Estate in Taplejung is conventionally farmed.

What Does Research on Ilam Terroir Actually Show?

A 2020 field study of five tea-plant clones sampled across Ilam district, Nepal (KC et al., Journal of Food Quality) sampled gardens in the same general elevation band as Sandakphu, at several sites in Suryodaya Municipality. It found that tannin, flavonoid, and phenolic content was consistently higher in green tea than in black tea made from the same leaf, because black-tea fermentation breaks some of those compounds down. That's part of why a black tea and an oolong from one farm can taste as different as Ruby Black and Dark Oolong. To be fair, this was a general study of clones across Ilam district, not a measurement of Sandakphu's own bushes, and altitude's effect on tea chemistry varies by study and cultivar. A separate 2025 field trial on Chinese high-mountain oolong actually found theanine falling at higher elevation, the opposite of the popular story. We won't squash that into one neat claim. We'll tell you honestly how the leaf tastes in the cup and leave the science as complicated as it really is. For wider context on Nepal's tea sector, see the National Tea and Coffee Development Board.

The same KC et al. (2020) data also tracked the ratio of theaflavins to thearubigins, conventionally read as about 1:10 to 1:12 once black tea fermentation has fully run its course, across those five Ilam clones. Four of the five had reached that range and one fell short. Fermentation timing in orthodox black tea isn't a simple on/off switch; producers judge it batch by batch, which is part of why two lots of Ruby Black Tea from the same hillside can taste slightly different from year to year.

How Should You Brew Tea From Sandakphu Tea Estate?

Ruby Black Tea: 90 to 95°C water, 3 to 4 minutes, about 3g of leaf per 250ml cup. Go toward the higher temperature and longer time for a bolder cup; the leaf can take it without turning bitter. Dark Oolong Tea: 90°C water, 3 minutes, the same 3g per 250ml. It also makes an excellent cold brew: steep it in the fridge for 6 to 8 hours for a smoother, sweeter take on the same stone-fruit character. Both are whole-leaf teas, so you can steep them again once or twice, with a slightly longer second infusion.

Frequently Asked Questions

Where is Sandakphu Tea Estate located?
Sandakphu Tea Estate is in Ilam, in the tea-growing hills of eastern Nepal, at 5,000 to 6,000 ft. It's one of Nepal Hills Tea's four named farm partners, along with Farmers Tea Co., Norling Specialty Tea, and Pathibhara Tea Estate in Taplejung. All our tea comes from these two Nepali districts.

Is Sandakphu Tea Estate certified organic?
Yes. Sandakphu Tea Estate is a certified organic farm at the grower level. Both teas we buy from it, Ruby Black Tea and Dark Oolong Tea, are grown under that certification. It applies to how the land is farmed, not to the label on the packaged tea.

What teas come from Sandakphu Tea Estate?
Two: Ruby Black Tea, a fully oxidised black tea with dark cherry, cocoa, and a velvety feel, and Dark Oolong Tea, an oolong oxidised to about 50%, with stone fruit, roasted honey, and bright acidity. Both are plucked by hand, orthodox-processed, whole leaf, and naturally free of bitterness.

Why do Ruby Black Tea and Dark Oolong Tea taste so different if they're from the same farm?
Processing, not soil. Ruby Black Tea is fully oxidised, while Dark Oolong Tea is stopped at about 50% oxidation. The level of oxidation shapes a tea's flavour more than any other processing step, which is why the same leaf from one hillside can make two completely different cups.

How should I brew Ruby Black Tea or Dark Oolong Tea?
Ruby Black Tea: 90 to 95°C water, 3 to 4 minutes, about 3g of leaf per 250ml. Dark Oolong Tea: 90°C water, 3 minutes, the same 3g per 250ml. Dark Oolong also makes an excellent cold brew steeped in the fridge for 6 to 8 hours.

Does tea from Sandakphu Tea Estate have bitterness?
No. Both Ruby Black Tea and Dark Oolong Tea are naturally free of bitterness. That comes from slow growth at high altitude, hand plucking, and careful orthodox processing and oxidation control at the farm. Nothing is added, blended, or done at the brewing stage to achieve it.

What's the easiest way to try tea from Sandakphu Tea Estate?
The Tea Sampler Kit ($30 CAD) includes both Ruby Black Tea and Dark Oolong Tea, plus eight other single-origin teas from all four Nepal Hills farms in Ilam and Taplejung. It's the easiest way to taste Sandakphu's hillside before buying a full bag.

Try Sandakphu Tea Estate for Yourself

Start with Ruby Black Tea if you want a bold black tea led by cocoa, or Dark Oolong Tea if you want something brighter and more complex; it's also one of our best teas for cold brew. Rather taste the whole farm before buying a full bag? The Tea Sampler Kit ($30 CAD) includes both.

Bhaskar Dahal is the founder of Nepal Hills Tea, a Canadian direct-trade specialty tea company sourcing single-origin loose-leaf teas from Ilam and Taplejung, Nepal.

Related reading: How to Cold Brew Oolong Tea · How to Cold Brew Black Tea · What Is Ilam Tea?