Robusta (Canephora): Caffeine, Cultivation, and Quality

Two figures do the rounds about Robusta, and neither of them is right: three times as much caffeine as Arabica, and a thirty per cent share of the world market. The real difference in caffeine is much smaller – and the share much larger.

First things first: we like both species. What belongs in your cup is your call, not botany's.

What is Canephora?

Coffea canephora is the second most important coffee species after Arabica. The trade name Robusta actually refers to a group of varieties within the species, but it is mostly used as a synonym. The species originates in the evergreen lowland forests of Central and West Africa, from Guinea to Uganda, where it grows at altitudes between 50 and 1,500 metres.

Botanically, Canephora is the simpler case: diploid with 22 chromosomes, meaning a normal twofold chromosome set – unlike Arabica's fourfold one. This very species was one of the two parent species from which Arabica emerged.

How much caffeine does Robusta really have?

More than Arabica, but not three times as much. The figures from the scientific literature: green Canephora beans contain 1.4 to 3.3 grams of caffeine per 100 grams of dry matter, typically 1.7 to 2.1. Arabica sits at 0.7 to 1.7, typically 1.0 to 1.2.

Animation 1 · Caffeine: the myth and the figures

Arabica, typical contentCanephora, typical contentthe “three times as much” claim

Unit: grams of caffeine per 100 grams of dried bean – the technical term for this is dry matter. Every bar starts at zero, so its length is directly comparable; the thin line below it shows the full range reported in the scientific literature. The evidence supports a factor of roughly 1.4 to 2, not 3 – none of the scientific sources we checked gives a factor of 3.

Source: dePaula & Farah, Beverages 5(2), 37, 2019.

A widely cited scientific review puts it like this: Canephora seeds contain 40 to 70 per cent more caffeine than Arabica. Other sources arrive at roughly double. The factor of three that appears in so many texts cannot be found in any of the scientific sources we checked.

The difference between the sources is real and comes down to different samples and measuring methods. That's why we give a range of 1.4 to 2 rather than a single number. What matters more for your cup anyway is the dosing: how much caffeine actually reaches you is decided by the dose, not the species.

How does Robusta differ chemically from Arabica?

These percentages come from a different study than the caffeine figures above – which is why caffeine is listed here as 0.9 to 1.2 per cent and there as 0.7 to 1.7 grams per 100 grams. Both are literature ranges across many samples with wide variation, not values we measured ourselves. Which range you come across depends on which study happens to be cited.

Two rows explain the reputation. The higher chlorogenic acids bring more harshness and astringency; the lower lipids and lower sugar content mean less sweetness and less body develop during roasting. That Robusta sits below Arabica in sucrose content is also confirmed by a more recent study from 2025.

For sucrose, we found no reliable species-specific percentages – the frequently cited figures could not be confirmed in any primary source. The direction is established, the magnitude is not.

How big is Robusta's share today?

Almost half. According to production data from the US Department of Agriculture from July 2026, Robusta's share in the 2025/26 crop year was around 47 per cent.

Animation 2 · How the shares are shifting

ArabicaRobusta (Coffea canephora)

Each column is an entire world harvest, i.e. 100 per cent; the figures in the columns are percentages. The label below the columns gives the crop year: 21/22 stands for 2021/22. Important: the percentages are our own calculation based on the USDA's volume figures – the USDA itself does not report shares.

2021/22 and 2025/26 come out at the same rounded value of 52.8% – calculated from quite different volumes. Not a transcription error.

* 2026/27 is a forecast. Source: USDA Foreign Agricultural Service, Coffee: World Markets and Trade, July 2026, Coffee Summary table.

The International Coffee Organization's export data show the same picture: in the first eight months of coffee year 2025/26, Arabica's share of green coffee exports fell to 60.2 per cent, down from 64.0 per cent in the same period a year earlier; Robusta exports grew by just under ten per cent over the same period.

The reasons aren't hard to find: Robusta is higher-yielding, more heat-tolerant and cheaper to produce – qualities that carry more weight in a warming climate. On top of that comes the biennial yield cycle in Brazil, which makes the Arabica figures swing from year to year.

Why is Robusta more resilient?

Because the species carries resistance genes against coffee leaf rust and copes better with drought and heat. For more than 70 years, Canephora has been the most important source of rust resistance in Arabica breeding – the well-known Timor Hybrids carry exactly these genes, which come from Canephora.

Animation 3 · Yields compared

dark: up to the lower valuelight: up to the upper value

Unit: kilograms of green coffee per hectare per year – a different unit from the caffeine chart above. All columns start at zero; the dark part reaches up to the lower value of the range, the light part up to the upper value.

* The third column shows Conilon clones. Conilon is the Robusta group of varieties widely grown in Brazil. “Clones” are cuttings from a single selected plant – all genetically identical. The peak values come from irrigated plantations with 2,000 to 4,000 plants per hectare (“high-density system”) – not an average.

Sources: Campuzano-Duque et al., Agronomy 11(12), 2550, 2021; Campuzano-Duque & Blair, Agriculture 12(10), 1576, 2022.

Then there's the higher yield. The direct comparison in the scientific literature gives 1,500 to 3,000 kilograms of green coffee per hectare for Arabica and 2,300 to 4,000 for Canephora. In irrigated high-density plantations with Conilon clones in Brazil, 4,800 to 7,200 kilograms have been documented – peak values, not averages.

Why is Robusta propagated from cuttings?

Because the species can't fertilise itself. Canephora has gametophytic self-incompatibility: pollen from a plant does not fertilise that plant's own flowers. Every plant needs pollen from another plant, and every seed is a new genetic mix.

In practice, this means two things. First, a Robusta field has to contain different genotypes, otherwise there is no fruit set. Second, a good tree can only be multiplied through cuttings or grafting, not from seed. That's the exact opposite of Arabica, where varieties such as Typica stayed stable for centuries when grown from seed.

The side effect is remarkable: because Canephora is constantly outcrossing, the species is genetically far more diverse than Arabica – and that is exactly what makes it the reservoir for breeding.

What is Fine Robusta?

A quality yardstick of its own. In 2014, the Coffee Quality Institute and the Uganda Coffee Development Authority jointly published the first comprehensive guide with standards and procedures for high-quality Robusta. Scoring takes place within the CQI's Q system, where the 80-point threshold applies.

The point isn't the number but the fact that the system exists: since then, Robusta has been judged by its own criteria instead of being measured against an Arabica yardstick that, by definition, it can never meet.

The original Fine Robusta standards document could not be retrieved via the official CQI addresses. The publishers, the year and the 80-point threshold of the Q system are documented; details on defect categories and screen sizes are something we cannot confirm first-hand.

Why is there Robusta in Italian espresso blends?

For body and crema. Robusta brings more soluble solids and a denser, longer-lasting crema to the cup – qualities you can see and feel in an espresso. Then there's the price: Robusta is considerably cheaper, which counts at a bar with high throughput.

There's one point here that we already made in our espresso article: a thick crema is not a mark of quality. Robusta produces it reliably, regardless of how good the coffee is. So if you take a lavish crema as proof of quality, all you end up measuring is the Robusta share.

In classic southern Italian blends, the Robusta share is often 20 to 40 per cent, and in Naples even higher. That's not a cost-cutting measure but a matter of taste: these blends are designed for milk drinks and for a strong, chocolatey base note that holds its own against sugar and milk. EstimateThe 20 to 40 per cent is a figure based on trade experience, not a surveyed statistic: roasteries generally don't disclose their blend ratios.

Does Robusta taste bad?

The bad reputation has a real core and an unfair half. The real core: a large part of the Robusta traded worldwide is grown as a bulk commodity, harvested by machine, processed without selection and used for instant coffee or cheap blends. What comes out of that really does taste flat and woody.

The unfair half: exactly the same treatment would produce flat, woody coffee from Arabica too. Carefully grown and processed Robusta from good farms tastes of cocoa, nuts and dark spices – different from Arabica, but not worse.

Our stance on this is the same as always: there are no coffee police. If a blend with Robusta tastes better to you than a pure Arabica, then that's the right blend for you.

Where can you get good Robusta?

Right here with us – and not just as an addition to a blend. Most specialty roasters don't carry Robusta at all, because it is seen as the opposite of quality. We see it differently and also roast it on its own.

If you want to taste the difference for yourself, the most honest test is a direct comparison: once Very Nutty on its own as an espresso, once a light Arabica such as Bright Cassis from Ethiopia. Two coffees that could hardly be more different – and neither of them is the better one. You'll find all our roasts among our coffee beans.

Frequently asked questions about Canephora and Robusta

What is Canephora coffee?

Coffea canephora, usually called Robusta in the trade, is the second most important coffee species after Arabica. It originates in the lowland forests of Central and West Africa, is diploid with 22 chromosomes and is fertilised exclusively through cross-pollination.

Does Robusta really have three times as much caffeine as Arabica?

No. The evidence supports a factor of about 1.4 to 2. One scientific review cites 40 to 70 per cent more caffeine; other sources arrive at roughly double. Typical values are 1.7 to 2.1 grams per 100 grams of dry matter for Canephora and 1.0 to 1.2 for Arabica.

How does Robusta differ chemically from Arabica?

Robusta has more chlorogenic acids (7 to 10 versus 5.5 to 8 per cent) and more minerals, but a lower lipid content (9 to 13 versus 12 to 18 per cent), less trigonelline and less sucrose. More chlorogenic acids and less sugar explain the harsher impression.

How big is Robusta's share of world production?

Bigger than is commonly assumed. According to USDA data from July 2026, Robusta accounted for around 47 per cent of world production in the 2025/26 crop year. The share has risen over recent years; the ICO's export data point in the same direction.

Why is Robusta more resilient?

Because the species carries resistance genes against coffee leaf rust and is more tolerant of drought and heat than Arabica. For more than 70 years, Canephora has been the most important source of rust resistance in Arabica breeding – the Timor Hybrids carry exactly these genes.

Why is Robusta propagated from cuttings?

Because Canephora cannot pollinate itself. The species has gametophytic self-incompatibility, so it depends on pollen from other plants. As a result, seeds from a single plant turn out genetically different; uniform stands can only be created through cuttings or grafting.

What is Fine Robusta?

A quality standard that the Coffee Quality Institute published together with the Uganda Coffee Development Authority in 2014 – the first comprehensive guide with standards and procedures for high-quality Robusta. In the CQI's Q system, the threshold is 80 points.

Does Robusta taste bad?

Poorly processed Robusta tastes bad – and so does poorly processed Arabica. The species brings more body, more crema and a harsher base note. Whether that's an advantage or a disadvantage depends on what you want to end up in your cup.

Can you buy pure Robusta?

Yes. At Coffee Coaching Club, we roast Very Nutty, a coffee made from 100 per cent Robusta from South India – Karnataka and Kerala, 850 to 950 metres, washed, with hazelnut notes and very low acidity. On top of that, there are several blends with a share of Robusta: Nutty Delight, Chestnut Delight and Cozy Nut.

What now?

If you've only known Robusta from supermarket blends so far, the most interesting experiment is a direct comparison: the same preparation, once with pure Arabica, once with a blend containing Robusta. The difference in body and crema is clearer than any description.

There's more on the other species in the Arabica article, and more on how quality is assessed under Specialty Coffee. How to get both into your cup properly is covered in the espresso dial-in. You'll find our coffee beans and the right coffee grinders in the shop – and if you want to compare without buying anything yourself: in the workshops in Bern and Zurich.

Sources and context

• Details on our own roasts – origin, altitude, processing – come from our product data and are our own data; the flavour notes reflect our own sensory assessment.
• Caffeine content and the factor between the species: dePaula & Farah, Beverages 5(2), 37, 2019; DaMatta et al., Brazilian Journal of Plant Physiology 19(4), 485–510, 2007.
• Chemical composition: Socha et al., Foods 10(6), 1208, 2021; sucrose direction: npj Science of Food, 2025.
• Production shares: USDA Foreign Agricultural Service, Coffee: World Markets and Trade, July 2026; export shares: International Coffee Organization, Coffee Market Report, June 2026. Percentage shares are our own calculation.
• Distribution, pollination, clonal propagation, rust resistance and yields: Campuzano-Duque & Blair, Agriculture 12(10), 1576, 2022; Campuzano-Duque et al., Agronomy 11(12), 2550, 2021; World Coffee Research, Robusta variety catalogue.
• Self-incompatibility: Sousa et al., Plants 11(22), 3023, 2022; comparative floral traits: Scientific Reports, 2019.
• Fine Robusta: Coffee Quality Institute, information on the collaboration with the Uganda Coffee Development Authority, 2014; 80-point threshold from the CQI documents on the Q system.
• The original Fine Robusta standards document could not be retrieved via official addresses; this is noted in the text.