Kolanut comes in two types in Nigeria, the cola nitida and cola acuminate. Kolanut is a plant that grows in hot tropical lowland forest, with a rainfall extending over a period of eight months or thereabouts and a temperature between 230c and 250c.

It is an evergreen plant that grows to a height of about 5 to 18 metres or more. The plant usually needs deep and well drained soil to grow and it thrives in sheltered valleys on the fringes of forest relics, where the soils are rich in humus.
About 88 percent of the world’s cola nitida crop is produced in Nigeria, and 90 percent of the product is consumed in the country especially in the kola chewing areas of the northern Nigeria. It is eaten raw for more stimulating effects, while 10 percent only is exported outside the shores.

There's a large export market for it because it has a lot of users. Moreover, kolanut can be processed into other products such as, beverages, kola powder, varieties of drugs and body creams. Let's quickly go through the requirements on how to start Kolanut export business.
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Source: http://westentrepreneur.com/634/how-to-start-a-profitable-kola-nut-export-business