In South America, Colombia is the leading flower producer and exporter accounting for 59% of all flowers imported to The United States in 2006. The United States imports 82% of its flowers. Growers in the United States state that 3 out of 4 flowers in the United States are grown outside the US with Colombia being the biggest exporter. The United States signed a free trade agreement with Colombia and that has lowered the cost of Colombian flowers in the United States. Ecuador has become, in recent years, the leading South American rose producer and is well known throughout the world for its high quality, large headed roses due to the high altitude location of its rose farms.