What is the difference between Red Bourbon and Yellow Bourbon?

Bourbon is one of the two foundational arabica varieties alongside Typica — introduced to Réunion Island (then called Bourbon) by the French in the early 18th century, it later spread to Brazil, Central America, and East Africa. In its original form, Bourbon produces red cherries when fully ripe: this is Red Bourbon. Yellow Bourbon (Bourbon Amarelo in Portuguese) is a natural mutation discovered in Brazil, most likely in the early 20th century, in which a single gene alteration affects anthocyanin synthesis — the pigment responsible for red colouration — causing the cherries to ripen yellow rather than red.

This colour mutation has practical implications for harvesting. Yellow Bourbon cherries transition directly from unripe green to ripe yellow, without an intermediate red stage. This can confuse less experienced pickers accustomed to using red as the primary ripeness indicator, increasing the risk of harvesting under-ripe or over-ripe cherries unless the farm manager properly trains the harvest team. Some producers view this as a disadvantage; others appreciate the clean visual contrast between the bright yellow ripe cherries and the darker green unripe ones at the same maturation stage.

In the cup, Red and Yellow Bourbon have genuinely different aromatic signatures, though the distinctions are modulated by terroir, altitude, processing method, and roasting approach. As a general pattern, Red Bourbon tends toward brighter, more acidic fruit profiles — red fruits (raspberry, morello cherry, cranberry), light tannin structure, and marked aromatic complexity. Yellow Bourbon tends toward sweetness, softer acidity, and yellow or tropical fruit notes (apricot, peach, yellow mango), with a more pronounced sugary finish and occasionally a light caramel note. These differences are most evident in washed (wet-processed) lots, which reveal the intrinsic varietal character most clearly.

In terms of productivity, Yellow Bourbon has a slightly higher reputation in Brazilian conditions, though differences are not consistent and depend heavily on microclimate and altitude. Both varieties are susceptible to coffee leaf rust and coffee berry borer, which explains why they have largely been displaced by Catuaí in many Brazilian regions — while remaining highly valued in specialty segments for their distinctive aromatic profiles. Many specialty producers today choose to process Red and Yellow Bourbon as separate micro-lots to highlight their differences, commanding premium prices on the specialty market.

• Colour at ripeness: Red Bourbon produces vivid red cherries; Yellow Bourbon (a Brazilian mutation) produces yellow to orange-yellow cherries — driven by a single anthocyanin gene difference.
• Aromatic profile: Red Bourbon leans toward bright red fruits (raspberry, morello cherry) with lively acidity; Yellow Bourbon tends toward yellow fruits (apricot, peach), softer acidity, and more sweetness.
• Harvesting challenge: Yellow Bourbon cherries go green to yellow without an intermediate red — pickers need training to identify ripe fruit by colour.
• Both varieties share the same agronomic vulnerabilities: susceptibility to leaf rust and coffee berry borer, making them challenging (but rewarding) to grow.
• Specialty value: producers often process the two varieties as separate micro-lots to capture their distinct aromatic signatures, selling at premium prices on specialty markets.