65-70 Days: By the 10th century, purple carrots were being grown in Afghanistan and northern Iran, which is considered their place of origin. Dye from purple carrots were used to dye the clothing of Afghan nobility. They were eventually imported into Europe by the 14th century where they were once widely accepted. This purple carrot appears purple on the outside, however once sliced, it shows a bright orange interior. They can reach up to 7 inches in length and are tender and sweet. They prefer full sun in zones 3-9.