Coffee Flowers Can Be Pink?! What's the Difference Between Pink and White Coffee Flowers?

For millions of coffee farmers around the world, the blooming of fragrant white flower clusters on coffee trees signals the approaching harvest season. The more abundant and dense the petals, the more coffee cherries farmers can harvest.

In our traditional understanding, coffee flowers typically appear in an elegant and simple pure white, consisting of 5-6 petals arranged in clusters along slender branches. Every February and March, the coffee trees near FrontStreet Coffee's storefront bloom randomly, releasing fragrances similar to other white flowers like jasmine, magnolia, and thyme, creating a refreshing and uplifting atmosphere.

But did you know that in some rare cases, coffee trees can also produce pink flowers? What causes this variation?

The Science Behind Pink Coffee Flowers

In an interview with Perfect Daily Grind, Oliveiro Guerreiro Filho, a genetics and plant breeding expert from the Agronomic Institute of Campinas in Brazil, explained that this rare pink flower phenomenon occurs primarily in two types of coffee varieties.

One type is caused by natural genetic variation in coffee plants. Research has found that certain specific varieties have a higher probability of producing pink flowers, such as the naturally low-caffeine variety Coffea racemosa and its hybrid offspring Aramosa.

Coffea racemosa (also known as racemose coffee), native to southern Africa, is a coffee variety with naturally very low caffeine content and one of the oldest varieties. It was first introduced to Brazil in 1954. Later, agricultural researchers at Campinas crossed it with Arabica, and through selection obtained the Aramosa variety, which is currently cultivated only in some small estates in Brazil.

While regular Arabica beans typically contain about 1.2%-1.6% caffeine, Aramosa coffee contains only 0.7%. However, this low-caffeine characteristic reduces the plant's resistance to pests, requiring this variety to be grown at higher altitudes. During the flowering season, Aramosa coffee trees produce rose-pink flowers, and their mature cherries display a purplish-red color.

The Purpurascens Variety

Another type of coffee tree that produces pink flower clusters is called Purpurascens, caused by spontaneous mutations in the plant's chromosomal DNA sequence. Gene expression determines the color of the entire plant - Purpurascens coffee trees have purple young leaves, new stems, and stipules, while their coffee flowers display a beautiful pink color. Researchers also mentioned that Purpurascens mutant coffee trees typically have lower yields and are more susceptible to pest attacks.

For example, in 2009, the owner of El Socorro estate in Guatemala discovered Purpurascens coffee plants with purple leaves and pink flowers among their Maracaturra seedlings. They immediately separated these plants for cultivation. After harvesting, they found that this mutant variety showed excellent cupping results, with fruit acidity reminiscent of black currant and ripe plums. Consequently, they used grafting techniques for commercial cultivation, which later won multiple Guatemala Cup of Excellence awards.

The Future of Pink Coffee Flowers

Most coffee growers may have never seen pink flowers on coffee trees and may never encounter them. However, as producers and researchers continue to develop hybrid varieties, we might see more coffee plants blooming with pink flowers in the near future.

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