Limes are round, green citrus fruits and are a rich source of Vitamin C. Growing on trees, there are a number of lime variations, which reach about 6 centimetres in diameter. In Brazil the main type produced is Tahiti limes (Citrus latifolia), whilst in Ghana the main type is small Key limes (Citrus aurantiifolia). The lime tree begins to bear fruit after approximately 3 to 6 years and reaches full production after 8 to 10 years. Although the tree produces fruit all year round, there is an increased demand during the winter months, because of tourism.