Coffee is actually a fruit and grows on trees (although often called plants). Coffee trees are not fast growers. In fact, it takes five years for a coffee tree to reach full maturity. Once it’s become mature, each mature coffee plant yields about 5 pounds of green (un-roasted) coffee beans per year. This results in less than one pound of coffee beans after roasting. It takes about 4000 coffee beans to produce a pound of coffee and roughly 50 coffee beans to produce one cup of coffee.