Yellow Bourbon Coffee

Yellow Bourbon is not a deliberate cross or a separate species, it is a color trait. Sometime around 1930, on a Red Bourbon farm near Pederneiras, in Sao Paulo state, a tree turned up whose cherries ripened yellow instead of red. Brazil’s Instituto Agronomico de Campinas began formally studying the trait in 1942 under researcher Carlos Arnaldo Krug, who traced the color to a recessive gene pairing growers still call Xanthocarpa, and planted roughly 30 distinct Yellow Bourbon lines within three years. Breeders still argue whether it is a spontaneous Red Bourbon mutation or an old cross with a separate yellow-fruited Typica strain called Amarelo de Botucatu. Either way, it is not a genetically stable population the way a modern F5 hybrid like Pacamara is: it is a recurring color trait inside the Bourbon lineage.

Brazil is still where nearly all of it grows commercially, spread across Minas Gerais’s Sul de Minas, Cerrado Mineiro, and Mantiqueira de Minas districts at a broad 900 to 1,800 meter band, according to Coffee Collective UK Ltd, a UK green-coffee retailer unaffiliated with the similarly-named Copenhagen roastery. That is a lower, easier-access elevation than what specialty buyers usually chase for a rarity variety, and low elevation is not the only reason it nearly vanished: Yellow Bourbon yields less and handles wind and rain worse than Red Bourbon, so growers spent decades replacing it with hardier, more productive cultivars until third-wave demand for its cup made keeping the old trees worthwhile again.

The three Coffee Review lots behind this profile all score in the low-to-mid 90s, but they come from two different countries and farms, so treat the averaged numbers as a snapshot of well-graded microlots, not a settled category score. Paradise Roasters’ Cerrado lot reads sweet and mild, tomato and milk chocolate with a hint of jasmine, while Seattle Coffee Works’ Guatemalan lot from Huehuetenango, grown well above Brazil’s typical elevation, pushes further into honey, dark chocolate, and orange with a livelier, juicier acidity. The highest-profile modern Yellow Bourbon lots are not Brazilian at all: Colombian producer Wilton Benitez runs the variety through an elaborate double-anaerobic, thermal-shock ferment that regularly earns Coffee Review’s attention, and Hawaii’s Kaʻu district turns out a washed microlot of its own most harvests, evidence that this old Brazilian mutation now travels on its own reputation, not its birthplace.