Black Greek olives are of the Conservolia variety, which grows mainly in Central and West Greece. Like other areas in the Mediterranean, Central and West Greece have ideal climates for growing olives, with hot, dry summers and cool, wet winters.
Black Greek olives start out a rich, dark green hue and they turn deep cocoa brown or black as they mature. Once the fruits are ripened and dark in color, they are harvested, typically from late October through December.