Grow cilantro by planting it in full or part sun, choosing a location with well-drained soil and watering it regularly. Add mulch and fertilizer to the plant throughout the growing season.
First, only plant cilantro in the spring or fall, before or after hot weather. A summer crop bolts, a term that means it quickly goes to seed. The soil temperature needs to be below 75 degrees Fahrenheit. Plant the cilantro seeds in 1/4-inch holes 2 inches apart using loamy, well-draining soil. Give the plants 1 inch of water per week, and then thin the seedlings once they are 2 inches tall from 3 to 6 inches apart.
At this point, water the plants only to keep the soil moist. Add a layer of mulch to the plants to keep the ground moist and cool and protect the shallow roots. Only fertilize cilantro once or twice a growing season using a nitrogen fertilizer.
Harvest the cilantro regularly. Once the weather warms up, the cilantro plant grows a stalk upon which the seeds are located. Allow the seeds to drop for a self-seeding annual plant, and then cut off the stalk. To save the cilantro seeds, a spice called coriander that is used in cooking, snip off the seed heads, and allow them to dry completely before storing them.