Tea Guides

Last updated: September 2026

Sandakphu Tea Estate is one of Nepal Hills Tea's four named farm partners, growing at 5,000–6,000 ft in Ilam, Nepal. It is grown on a certified organic farm, and it is the single hillside 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 across all four types, sourced from all four of our farms in Ilam and Taplejung at 5,000–6,000 ft, none of them bitter. If you already know you like bold black tea or a roasted oolong, keep reading: this article is about the one farm, Sandakphu, that grows both.

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

Sandakphu Tea Estate sits at 5,000–6,000 ft in Ilam, in eastern Nepal's tea-growing hills. At that height, the tea plant grows slower than it does in the lowlands. Slower growth gives the leaf more time to build flavour compounds instead of rushing toward size — the same basic mechanism 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, not an industrial plantation. Every batch is hand-plucked and orthodox-processed in small lots, which is part of why the cup comes out smooth instead of harsh. That's the whole promise behind Nepal Hills Tea's no bitterness standard, and Sandakphu is one of the two certified organic farms that make it possible.

The direction of that effect shows up in comparative research too: a 2013 planting trial across three South Indian altitudes (Muthumani et al., Journal of Natural Products and Plant Resources) found black tea grown at the highest of the three test elevations had a significantly higher flavour index and theaflavin content than genetically identical tea grown lower down. That trial was conducted at elevations well above Sandakphu's own 5,000–6,000 ft, and altitude's effect on tea chemistry isn't identical across every study and cultivar — but the general pattern, cooler and slower growth concentrating flavour compounds, is the same mechanism at work on this hillside.

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

Sandakphu Tea Estate grows the leaf behind two Nepal Hills products: Ruby Black Tea and Dark Oolong Tea. Both come from the same bushes on the same hillside — the difference is entirely in processing. Ruby Black Tea is fully oxidised, orthodox-rolled, producing a deep ruby-red cup with dark cherry, cocoa, and a velvet mouthfeel. Dark Oolong Tea is only about 50% oxidised, giving a completely different profile: stone fruit, roasted honey, and a bright acidity that lingers. Same soil, same farmer, two finished teas that taste like they came from different countries. That's the value of buying single-origin: you can taste what processing choices actually do 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.”

The mechanism behind Dark Oolong Tea's smoothness at roughly 50% oxidation is documented in oolong processing research: a 2023 Fujian oolong processing trial (Lu et al., Foods) found that lighter, shorter shaking paired with longer standing time during partial oxidation significantly increased catechin retention and produced a measurably lower bitter-astringency index than heavier, longer shaking on the same cultivar. Sandakphu's Dark Oolong Tea is processed the gentle way — which is part of why 50% oxidation reads here as stone fruit and roasted honey, not as 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. That certification belongs to the farm, not to the finished tea itself, which is why we always describe it that way rather than calling the tea "certified organic tea." Sandakphu is one of two Nepal Hills farm partners with full organic certification 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 follows organic farming practices without a formal certificate yet.

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 Sandakphu sits in, growing at multiple sites within Suryodaya Municipality. The same study found tannin, flavonoid, and phenolic content were consistently higher in green tea than in black tea made from identical leaf, because black-tea fermentation breaks some of those compounds down — part of why a black tea and an oolong from one farm can taste as different as Ruby Black and Dark Oolong do. Worth noting honestly: this was a general Ilam-district clone study, not a measurement taken on Sandakphu's own bushes, and altitude's effect on tea chemistry varies by study and by cultivar — a separate 2025 field trial on Chinese high-mountain oolong actually found theanine dropping at higher elevation, the opposite of the popular narrative. We don't flatten that complexity into a single tidy claim; we just tell you honestly what the leaf tastes like in the cup, and let the science stay as complicated as it actually is. For broader context on Nepal's tea sector, see the National Tea and Coffee Development Board.

The same KC et al. (2020) dataset also tracked theaflavin-to-thearubigin ratio — a measure conventionally read as roughly 1:10 to 1:12 when black tea fermentation has fully run its course — across those five Ilam clones, and found four of the five had reached that range, with one falling short. Fermentation timing in orthodox black tea isn't a simple on/off switch; it's a variable producers actively judge batch by batch, which is part of why two lots of Ruby Black Tea from the same hillside can still taste subtly different year to year.

How Should You Brew Tea From Sandakphu Tea Estate?

Ruby Black Tea: 90–95°C water, 3–4 minutes, about 3g of leaf per 250ml cup. Push the temperature and time toward the higher end if you want a bolder cup — the leaf can take it without turning bitter. Dark Oolong Tea: 90°C water, 3 minutes, same 3g-per-250ml ratio, and it's an excellent cold brew — steep it in the fridge for 6–8 hours for a smoother, sweeter version of the same stone-fruit character. Both teas are whole leaf, so they can be re-steeped 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 eastern Nepal's tea-growing hills, at an elevation of 5,000–6,000 ft. It's one of Nepal Hills Tea's four named farm partners, alongside Farmers Tea Co., Norling Specialty Tea, and Pathibhara Tea Estate in Taplejung — all sourced exclusively from these two Nepali districts.

Is Sandakphu Tea Estate certified organic?
Yes. Sandakphu Tea Estate is grown on a certified organic farm at the grower level. Both teas sourced from it — Ruby Black Tea and Dark Oolong Tea — carry that certification through to the farm, not the finished product label, since certification applies to how the land is farmed, not to the packaged tea itself.

What teas come from Sandakphu Tea Estate?
Two: Ruby Black Tea, a fully oxidised black tea with dark cherry, cocoa, and a velvet mouthfeel, and Dark Oolong Tea, a roughly 50%-oxidised oolong with stone fruit, roasted honey, and bright acidity. Both are hand-plucked, 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?
The difference is processing, not soil. Ruby Black Tea is fully oxidised; Dark Oolong Tea is stopped at roughly 50% oxidation. Oxidation level is the single biggest driver of flavour in tea processing, which is why identical leaf from one hillside can produce two completely different finished cups.

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

Does tea from Sandakphu Tea Estate have bitterness?
No. Both Ruby Black Tea and Dark Oolong Tea are naturally free of bitterness. That's the result of high-altitude slow growth, hand-plucking, and careful orthodox processing and oxidation control at the farm — not an additive, a blend trick, or anything done at the brewing stage.

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 alongside eight other single-origin teas from all four Nepal Hills farms in Ilam and Taplejung — the lowest-commitment way to taste Sandakphu's hillside for yourself before buying a full bag.

Try Sandakphu Tea Estate for Yourself

Start with the Ruby Black Tea if you want a bold, cocoa-forward black tea, or the Dark Oolong Tea if you want something brighter and more complex — it's also one of our best cold-brew teas. Prefer to taste the whole farm before committing to 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?