Oranges have been common in the Canary Islands for centuries. Christopher Columbus took orange seeds from Canary islands for his journey across the Atlantic Ocean to Haiti, where he planted orange orchards. They are grown in subtropical and tropical America, northern and eastern Mediterranean countries, Australia, and South Africa. Orange trees grow about five to eight meters tall. Evergreen means they produce flowers and fruit all at the same time. Oranges are picked when fully ripe, usually the harvesting season is between the month of October and May. Oranges can be either sweet or bitter. The most popular varieties are Valencia, Navel, Persian varieties and blood oranges.