GMB 7

One of the Gambung series of Indonesian clones, released by the research institute at Gambung in West Java and widely planted across the country’s tea area. Indonesia’s industry was built by Dutch planters on Assam material and has run on clonal selections since; the GMB numbers are the current generation of them and appear on essentially no packaging anywhere.

Camellia sinensis var. assamicaGMB 7IndonesiaAlso called Gambung 7

Where it sits in the botany

GMB 7 is recorded under Camellia sinensis var. assamica, the variety group one level above cultivar. It is associated with Indonesia, which is where it was selected or is most widely planted rather than the only place it grows.

Registration code: GMB 7. A breeding or registration code identifies the selection in an institutional register and is often the name a grower uses when the trade name is not.

Also transliterated as: gmb 7, gmb-7.

Where it came from

Released by the Indonesian tea and cinchona research institute at Gambung within its numbered GMB series.

How firm this is: Inferred rather than taken from a primary breeding or registration record. The series and the institute are consistently reported; the release year, parentage and recorded traits were not verified against a primary source.

What the plant is like

Assam-derived material for Java’s year-round production at moderate to high altitude. Indonesian tea is sold overwhelmingly as a blending component, so the plant behind it is invisible downstream.

Why a grower plants it

Yield, hardiness, when it buds, what it resists and whether a machine can cut it. This is the half of a cultivar’s identity that decides what is actually in the ground, and it is usually left out of writing aimed at drinkers.

Selected for Java's growing conditions, which are equatorial, high-altitude and productive year-round with no dormancy — so the specification is steady output, disease tolerance in a wet climate, and suitability to the manufacture the industry actually runs. Indonesia's tea sells overwhelmingly as a blending component rather than under its own name, and a clone series is judged against that: consistency and cost per kilogram, not distinction.

What it does in the cup

Reported as giving a full, coloury Assam-type liquor suited to blending. Indonesian tea is rarely tasted as itself, so trade description of any individual clone is thin.

How much of this is really the cultivar?

The interesting fact about the GMB series is that it appears on essentially no packaging anywhere, which is the ordinary condition of a tea plant. A whole national industry runs on a handful of numbered selections, and the drinker meets their output as an unnamed fraction of a teabag. Cultivar naming is a speciality-market practice rather than an industry one, and any impression that plants are usually identified downstream comes from reading a small and unrepresentative part of the trade.

Cultivar, growing site and processing all shape a cup, and the cultivar is very often the smallest of the three. It is also the one that fits on a label, so almost every commercial incentive runs toward overstating it. This section is on every cultivar page that has been reviewed for it, including the ones where the honest answer is “less than you would think”.

What it is usually made into

The categories this cultivar is typically processed into. It is a statement about common practice, not a limit — processing decides the category, and a cultivar can be taken down more than one route.

Black tea — Tea taken deliberately through full enzymatic oxidation, giving the dark leaf, amber-to-red liquor and malty or brisk character most Western drinkers think of as simply 'tea'.

Teas in the catalogue made from GMB 7

Sources

TeaHQ editorial synthesis — TeaHQ

This page is TeaHQ’s own synthesis throughout. No breeding register or institutional record stands behind the account above, which is why the origin note carries its confidence in the open rather than reading as a citation.

How TeaHQ handles sources