Green and black olives grow on the same tree. Immature olives are green in color. The maturing cycle takes six to eight months, during which the olives turn black, purple or red. Processing turns the fruit into table olives and olive oil for consumption.
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Angela Nelson is a virtual assistant and freelance writer. She has been publishing online articles since 2008 for GardenGuides, eHow and Answerbag. Nelson has a passion for small business and flower gardening, which is portrayed in her writing.