When a coffee “doesn’t show up” in cupping or brewing, the problem is often not the beans, but the water. Hardness (calcium and magnesium) affects how much you extract, and alkalinity (bicarbonates) determines how much acidity gets “flattened” and bright notes are buffered. With very soft water, coffee can taste sharp, thin, or overly sour; with very hard or very alkaline water, the cup can feel dull, heavy, and less clearly sweet. That is why the same lot can taste “differen

It all starts on the farm with harvesting, where the golden rule is to pick ripe cherries and avoid mixing in unripe, overripe, or damaged fruit. Good selection at the farm reduces defects from the very beginning, which is why many producers do multiple passes through the same plots to keep ripeness uniform. Processing begins the same day as picking, because the time between harvest and the mill influences unwanted fermentation and the risk of dirty flavors. At this stage, cl

Green coffee behaves like an aromatic sponge, which is why a container that previously carried chemicals, fish, rubber, or fragrances can ruin a cup without leaving obvious clues on the beans. The most frustrating part is that the defect often shows up only after roasting and grinding, when it is too late to “fix” something that happened in transit. In the cup, these contaminants can present as plastic, gasoline, soap, treated wood, or stale damp notes, and they can intensify

Between 2021 and 2025, the five countries that produce roughly three quarters of the world’s coffee experienced, on average, 57 additional days per year with temperatures above 30°C in coffee growing areas, a threshold that is especially damaging for arabica. In the same analysis, El Salvador saw 99 additional days of harmful heat, Brazil 70, and Ethiopia 34, which helps explain why some origins report more stress, less uniform flowering, and greater vulnerability to pests. F