In Kodagu district, Karnataka, sixty-year-old Excelsa coffee trees stand as witnesses to a quiet revolution—trees that a single family preserved when the rest of the global coffee industry overlooked them, now poised to reshape how the world grows its morning cup. As rising temperatures, shifting rainfall patterns, and intensifying pest pressure threaten the two species that account for nearly all commercial coffee production, researchers and growers in India and Uganda are reviving forgotten coffee varieties once deemed too unwieldy to cultivate, betting that climate resilience matters more than tradition.
Arabica and Robusta have long held an absolute grip on the global coffee market. But their dominance is proving fragile. Aaron Davis, a senior research leader at the Royal Botanic Gardens, Kew, warns that "the next decade or so" could bring major market disruptions as climate-adapted species assert themselves—a shift already underway on the ground.
Akshay Dashrath, co-founder of the South India Coffee Company, is leading the charge to rehabilitate Excelsa, a species native to tropical Africa and Southeast Asia that a British planter introduced to India in the late 1800s as an Arabica alternative. For generations, Excelsa was relegated to the margins of Indian plantations, valued only as a boundary marker or shade tree because its tall, dense growth made it impractical to harvest and scale. The sixty-year-old Excelsa trees on Dashrath's family farm in Kodagu became an unexpected asset—a genetic reservoir now being studied through a collaboration between his company and the Royal Botanic Gardens, Kew.
Uganda and Vietnam have already moved ahead with Excelsa cultivation. Kiwuka Catherine, a senior research officer at Uganda's National Agricultural Research Organization, reports that farmers who have been growing Excelsa across hundreds of acres since the 2000s consistently report that the species outperforms Robusta in productivity, resilience, and profitability. Davis predicts that "Ugandan Excelsa could feature in supermarkets within a decade"—a mild-flavored coffee finally ready for mainstream markets.
But Excelsa is not alone. Researchers are simultaneously studying Stenophylla, which offers an Arabica-like flavor profile with superior heat tolerance, and Liberica, a hardier species that thrives in conditions ranging from humid lowlands to drier regions. At Kerehaklu coffee estate in Chikkamagalaru district, manager Pranoy Thipaiah has observed that both Excelsa and Liberica bring an additional advantage: their long growing seasons allow harvests in March and April, dodging the unseasonal rains that frequently devastate Arabica crops.
Perhaps most intriguingly, Kew-led research has identified an entirely new hybrid—Libex coffee—that combines Liberica and Excelsa genetics to potentially withstand heat and moisture stress while resisting disease. This engineered resilience may prove crucial as climate pressures intensify.
Yet moving these species from experimental plots to global supply chains requires more than scientific promise. Experts emphasize that the transition to mainstream production will demand focused research, government backing, and perhaps most critically, consumer acceptance. The coffee in your cup today is the product of centuries of preference and habit. Breaking that pattern, even for survival, will test whether markets can embrace change as readily as climate change itself demands it.