The problem Ethiosar was bred to solve
Coffee farming is under pressure. Climate change, unpredictable rainfall, and the persistent threat of coffee leaf rust (Hemileia vastatrix) have made it increasingly difficult to grow the same varietals in the same places in the same way. Regions that relied on just one or two plants – Caturra, say, or Castillo – found themselves exposed when disease hit or conditions shifted. Genetic diversity, it turns out, isn't just interesting. It's essential.
This is the context in which Ethiosar was born: a deliberate, multi-generational breeding project that asked whether it was possible to create a varietal with the resilience to survive a changing climate and the cup quality to justify the effort. The answer, as it turns out, was yes.
Where Ethiosar comes from
Ethiosar was developed by the Mierisch family at their farms in the Matagalpa region of Nicaragua – and the story actually starts with a cousin named Ricardo. He was growing coffee at a lower altitude, around 800 metres, and noticed something was wrong. Yields were dropping. Disease pressure was increasing. He put this down to a combination of climate change, rising rainfall, and the general difficulty of farming coffee at lower elevations. But one plant stood out. It was thriving where the others weren't – fruiting well and fighting off disease with ease. That plant became the starting point for what would eventually be named Ethiosar (and informally, Ricardo, after the man who spotted it).
The varietal itself is the result of careful, multi-step hybridisation:
- Sudan Rume – a rare wild arabica, first discovered in the 1940s on the Boma Plateau in what is now South Sudan. It's one of the most genetically pure forms of Coffea arabica in existence, valued in breeding programmes worldwide for its extraordinary flavour complexity: floral, fruity, and deeply sweet. It's also a genetic ancestor of SL-28, the celebrated Kenyan varietal. Low-yielding and disease-susceptible on its own, it's rarely grown as a standalone crop – but as a flavour donor in hybrids, it's exceptional.
- Sarchimor – a hybrid of Villa Sarchi (a compact dwarf mutation of Bourbon from Costa Rica) and the Timor Hybrid (a natural arabica × robusta cross). Sarchimor was bred specifically for rust resistance and high productivity. Its robusta lineage gives it a natural immunity to leaf rust that pure arabicas simply don't have.
- The offspring of Sudan Rume × Sarchimor was then backcrossed with Villa Sarchi – adding sweetness, cup clarity, and compact plant structure while preserving the disease resistance.
The result is a stable hybrid that sits at a genuine crossroads: African heirloom complexity, Bourbon-lineage sweetness, and robusta-derived resilience. Not a shortcut. A considered solution.
The Mierisch family and Finca Limoncillo
The Mierisch family's coffee story begins in the late 1800s, when Bruno Mierisch Boettiger – a German geologist – arrived in Nicaragua to help build the National Railroad. When the government couldn't pay him in cash, they offered land in the mountains of Matagalpa instead. Bruno stayed, planted his first coffee trees in 1908, and set in motion a family legacy now spanning five generations.
Finca Limoncillo, named after the small lemon trees growing there when it was acquired in the 1930s, sits in Yasica Norte in Matagalpa at elevations between 850 and 1,200 metres. At 171 hectares – 109 of them dedicated to coffee – it's a substantial farm, notable for its nine waterfalls and exceptional biodiversity. The family employ over 3,000 staff during harvest, and more than 60 families live on the farm full-time.
We've been buying from the Mierisch family since 2007. It's one of our oldest and most valued relationships in coffee – and their reputation for experimental processing and varietal work is, frankly, unmatched in Nicaragua.
Why Ethiosar matters for farmers
Beyond the cup, Ethiosar makes a compelling case on the farm. It yields up to 40% more than Caturra, one of the most widely planted varietals in Latin America. It requires fewer plants per hectare – around 2,800 per manzana, compared to over 4,000 for Caturra – which means lower input costs, less pruning, and less fertiliser. And crucially, its Timor Hybrid lineage gives it a natural resistance to coffee leaf rust that reduces or eliminates the need for chemical treatment.
That disease resistance matters more than ever. Leaf rust has devastated crops across Central America, and the pressure is only growing as temperatures rise and weather patterns shift. A varietal that holds its own without constant intervention isn't just convenient – it's a meaningful step toward more resilient, sustainable coffee farming.
What it tastes like
Ethiosar's cup profile reflects its heritage. The Sudan Rume parentage contributes floral and fruity complexity; the Villa Sarchi influence brings refined sweetness and a clean, rounded body. The overall profile tends toward the chocolatey and sweet, with muted but present acidity and a lingering, clean finish. Depending on processing method, you might find plum, raspberry, and orange in a natural; shortbread, toffee, and sultana from a honey; or something crisper and more defined from a washed lot.
It's a flexible varietal that rewards careful roasting – and one that consistently punches above its weight for a hybrid.
Further reading
- Perfect Daily Grind: Understanding the Myth of Heirloom Variety Coffee
- SCA: Coffee Plants of the World
- Frontiers in Sustainable Food Systems: Validating South Sudan as a Centre of Origin for Coffea arabica
| Varietal | Ethiosar (also known as Ricardo) |
| Related to | Sudan Rume, Sarchimor, Villa Sarchi, Timor Hybrid |
| Origin | Nicaragua |
| Botanical type | Stable hybrid (heirloom × hybrid cross) |
| Optimal elevation | 800 m and above |
| Fruit colour | Red |
| Fruit size | Medium |
| Disease resistance | High – especially to coffee leaf rust (roya) |
| Yield | High – up to 40% more than Caturra |
| Tasting notes | Sweet, chocolate-toned, muted acidity, good body |