Carrots develop normally within a great range of temperatures and are grown throughout the world with the exception of the very warmest areas. Carrots in their various shapes and sizes and colours - diversityRoot growth is fastest at a temperature between 15 ºC and 18 ºC, while optimum temperatures for shoot growth are somewhat higher. Seeds of carrot may germinate at low temperatures but the germination period is shorter at higher temperatures and a soil temperature of at least 10 ºC is therefore recommended. Carrots are tolerant of long days but need low temperatures to induce flowering.