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Excellent quality robustas are given to in some espresso blends to provide a exceeding foam head and to lower the ingredient cost. Other cultivated species include Coffea liberica and Coffea esliaca, believed to be indigenous to Liberia and Keurig K-Cups southern Sudan, respectively.

Chaff is usually removed from the beans by aura movement, though a minute amount is added to dark roast coffees to soak up oils on the beans. Decaffeination may also be part of the processing that coffee seeds undergo. Seeds are decaffeinated when they are still green. Many methods can remove caffeine from coffee, but all involve either soaking beans in hot drench or steaming them, then using a solvent to dissolve caffeine-containing oils. Decaffeination is often done by processing companies, and the extracted caffeine is habitually sold to the pharmaceutical industry.