Plant carrot seeds in the ground about three to five weeks before the last spring frost date. Plant carrots into fine sandy soil that doesn't have rocks in it. Don't apply fresh or rotted manure to the soil before planting carrots in it, as it may cause side roots to appear on the carrots later. Place the seeds into the ground, leaving about 3 to 4 inches of space in between them, and leave about 1 foot between the rows.
Place some mulch onto the carrots to prevent water from evaporating too quickly, speed up the growth of carrots and prevent the sun from shining on the roots. Make sure that the soil in which the carrots are growing is well-drained and loose, as if it isn't, the carrots might split up into several parts, grow additional roots or start growing very slowly. When the carrots grow to be about 1 inch tall, remove some of the weaker plants so that the distance between carrots is about 3 inches. It is better to snip them with scissors instead of pulling the carrots out, as that can harm the plants that stay in the ground.
Carrots require at least 1 inch of water per week. To grow larger carrots, treat them with fertilizer about five to six weeks after sowing. The flavor of carrots improves if they stay in the ground for the first several frosts, so cover them with some tree leaves after the first frost, and leave them in the ground.