Excess organic debris worked into the soil just before planting also may affect root penetration, causing forked and twisted roots. Space rows 12 to 18 inches apart. A single radish seed planted every 6 to 12 inches can mark the row. Germination requires as long as two weeks and the seedlings may not emerge uniformly. If heavy rains occur after sowing, packing the soil surface, no seedlings may emerge.
Carrots germinate best in warm, moist soil.
Covering the row with clear polyethylene film warms the soil and conserves moisture. Remove the film immediately when seedlings appear. To assure germination of successive plantings during the late spring and summer months, it may be necessary to supply water by sprinkling. Young carrot seedlings are weak and grow slowly. It is essential to keep weeds under control for the first few weeks.