Charrier Coffee

Where is Charrier coffee primarily grown, and what are its ideal growing conditions?

Charrier coffee (Coffea charrieriana) is not a widely cultivated commercial crop; rather, it is a rare species endemic to the Bakossi Forest Reserve in western Cameroon.¹

Unlike many commercial coffee varieties that are grown on large-scale plantations, this species is naturally found inhabiting the steep, rocky slopes of wet rainforests. Its ideal growing conditions are defined by this specific forest understory environment, which provides the moisture and shade necessary for the plant to thrive in its native habitat.¹

While Charrier coffee is notable for being the first discovered species to produce naturally caffeine-free beans, it is not currently grown under the standardized agricultural conditions—such as specific temperature ranges or sun-versus-shade management—used for global coffee production. Researchers have noted that if cultivated in large quantities, it could potentially serve as a sustainable source of decaffeinated beans, reducing the need for chemical processing.²¹

What are the unique characteristics of the Charrier coffee plant in terms of its appearance and growth habits?

The Coffea charrieriana, or Charrier coffee, is a distinct species characterized by its compact size and specific morphological features.

Appearance and Growth Habits

• Plant Structure: It grows as a small shrub, typically reaching a height of approximately 1 to 1.5 meters (about 3 to 5 feet).²
• Foliage: The plant features thin, elliptical leaf blades that are relatively small, measuring between 2.2 and 3.5 cm (0.9 to 1.4 inches) in length.²
• Seeds: The plant produces smooth, elliptical seeds that are approximately 5 mm (0.2 inches) long.²
• Growth Environment: It is endemic to the steep, rocky slopes of wet rainforests within the Bakossi Forest Reserve in western Cameroon.²

Unlike many other species in the genus Coffea, this plant is uniquely recognized for producing naturally caffeine-free beans, a trait that distinguishes it from other known coffee varieties.²

What is the history of the discovery and cultivation of Charrier coffee?

The discovery and scientific classification of Charrier coffee (Coffea charrieriana) represent a significant milestone in botanical research. Although the plant was first collected in 1983, it remained scientifically undescribed for decades. It was not until 2008 that a morphological study confirmed the plant did not conform to any previously known species within the genus Coffea.²

The species is named in honor of André Charrier, a French botanist and geneticist celebrated for his contributions to coffee breeding and research. Endemic to the Bakossi Forest Reserve in western Cameroon, the plant is naturally adapted to the steep, rocky slopes of wet rainforests.²

While the plant is not currently grown as a commercial crop, its discovery is highly significant. It is the first known species to produce naturally caffeine-free seeds. Researchers suggest that if cultivated in large quantities, it could provide a sustainable alternative to chemical decaffeination processes, which often diminish flavor, or the use of genetically engineered plants.²

How does the processing of Charrier coffee beans differ from traditional coffee processing methods?

The processing of Coffea charrieriana, or Charrier coffee, differs fundamentally from traditional coffee because it does not require any decaffeination process at all.

Traditional coffee beans naturally contain caffeine, a stimulant that must be removed through industrial decaffeination methods if a caffeine-free product is desired. These methods—which include the use of chemical solvents (such as ethyl acetate or methylene chloride), the Swiss Water Process, or supercritical carbon dioxide extraction—are applied to green beans to strip away the stimulant. These processes are often criticized for being costly, potentially altering the bean’s flavor profile, or requiring the use of chemicals.²⁴⁵

In contrast, Charrier coffee is the first known species to produce naturally caffeine-free seeds. Because the plant lacks caffeine at the biological level, the beans do not need to undergo any of the aforementioned extraction techniques to be marketed as decaffeinated. Consequently, utilizing this species could eliminate the need for industrial processing entirely, preserving the natural flavor and quality of the coffee.²