Blueberries are flowering plants of the genus Vaccinium with dark-blue berries. Species in the section Cyanococcus are the most common fruits sold as “blueberries” and are mainly native to North America. They are usually erect but sometimes prostrate shrubs varying in size from 10 centimetres to 4 metres tall. In commercial blueberry production, smaller species are known as “lowbush blueberries” and the larger species, are known as “highbush blueberries”. The leaves can be either deciduous or evergreen, ovate to lanceolate, and 1–8 centimetres long and 0.5–3.5 centimetres broad. The flowers are bell-shaped, white, pale pink or red, sometimes tinged greenish.