Natural process

Coffee processing method where whole cherries (intact pulp) dry in the sun for 3-6 weeks. Produces coffees with fermented fruit, chocolate and wine notes. Oldest method, dominant in Ethiopia and Brazil.

Background & Context

The natural process (dry process) is the oldest and simplest coffee post-harvest method: whole coffee cherries, freshly harvested, are spread on raised drying beds or concrete patios and sun-dried for 3–6 weeks with the fruit pulp, mucilage, and parchment all intact around the seed. Ethiopia and Yemen used this method for centuries before wet processing was developed. During the extended drying period, yeasts and bacteria on the cherry surface and in the mucilage ferment the fruit sugars, generating aromatic compounds — esters, alcohols, organic acids — that slowly migrate through the parchment into the green bean. The result is a coffee that expresses dramatic fruit intensity: blueberry, tropical fruit, strawberry, grape, sometimes wine or fermented-beverage notes. Natural process coffees also tend toward higher body and lower perceived brightness than washed coffees because fewer organic acids are extracted into solution. Brazil processes approximately 70% of its Arabica and nearly all Robusta as naturals. Ethiopia, Yemen, and Bolivia also have high natural rates. The quality ceiling of naturals is extremely high — the world's most celebrated Cup of Excellence and Best of Panama lots include exceptional naturals — but the floor is also lower: poor cherry sorting and mismanaged drying produces defective, fermented, or rotting-fruit off-flavours.

Practical Use

When tasting a natural coffee for the first time: expect a flavour experience unlike any washed coffee. Prepare yourself for intense fruit notes that may initially feel unusual if you are accustomed to clean, bright washed coffees. Brew at 91–93°C (slightly lower than washed to prevent amplifying fermentation notes). Bloom for 45 seconds. If the coffee tastes 'fermented', that is typical of the style — but if it tastes 'rotten' or 'sour in a bad way', the coffee may have a processing defect.

Related Terms

Related terms: Washed process — the clean-cup alternative. Honey process — intermediate between natural and washed. Drying — the most critical step in natural processing. Ethiopia — origin of natural processing, benchmark for quality naturals.