Tea was planted in Argentina during the 1920s but the tea produced was not of good quality. In 1951 tea imports were banned which led to the growth in production. Tea is mainly produced in the beautiful north western province of Misiones where sub-tropical rainfall is good enough to produce crops between November and April. Because of the limited availability of labour, all tea is machine harvested and processed through factories that operate with maximum automation. Most Argentine tea is exported to the USA.