It takes approximately four years for a coffee bush to produce a useful crop. The first sign of the size and health of the crop is the white flowers which appear along the branches. The fruit or "cherry" (named because of its resemblance, not its flavour) is green at first, but changes to yellow and finally to red when it ripens.
The cherry should only be picked when red, the work is extremely labour intensive. Coffee cherries do not ripen simultaneously even when they are on the same branch so mechanical picking is not a particularly viable option, although it is used in some areas. Coffee bushes are kept at a manageable height of around six feet for harvesting purposes. In the wild they can grow much higher.
Depending on the country of origin and the quality of bean, coffee is usually processed in one of two ways:
"Dry Processing": this process involves spreading the cherries out on the ground to dry in the sun for two or three weeks. The cherries are then fed into machines which remove the outer husk. The green bean is now ready to be cleaned and sorted.
"Wet Processing": this process involves soaking or "fermenting" the ripe cherries in tanks until the outer layer is ready to be moved. This layer, called pulp or "mucilage" is then removed by machine. The bean is then left encased in a dry brittle covering known as "pergamino" or "parchment". The coffee can be left in this state for some time, or the parchment can be removed in order to sort the coffee into grades.
Of the two methods "Wet Processing" is usually considered to produce higher quality coffee but at the same time is more expensive
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