Daucus Carotus This cross between Nantes and Imperator has purple skin and an orange interior; you can't miss it! Cosmic Purple has a sweet and spicy flavor. The roots are 6-7" long. 70 days. Sow your Carrot seeds directly into vegetable garden as soon as soil is workable. Cover seeds with 1/8 inch soil. Thin plants when plants are 2 - 4 inches tall, thin to 2 to 3 inches apart. Rows can be spaced 15-18 inches apart, or much closer if you are limited for space. Keep soil moderately moist during germination. You can Plant at 2 or 3 week intervals for continual harvest. Planting can continue thru mid-July.