Plant cilantro in the spring after the last frost date or in the fall. In the Southwest, a fall planting may last through spring when the weather heats up again.
Do not grow in summer heat as the plants will bolt (so it is past harvesting). The leaves that grow on bolted plants tend to be bitter in flavor.
it is best to chose a sunny site that will allow cilantro to self-seed as it is ought to do. Plant in an herb garden or the corner of a vegetable garden. When the weather gets warm, the plant will quickly finish its life cycle and send up a long stalk which will produce blossoms and later seeds. Little plants will sprout during the season and the next spring.
Plant the seeds in light, well-drained soil and space them 1 to 2 inches apart. Sow the seeds at 3-week intervals for continued harvest.
Space rows about 12 inches apart.
It is important to keep the seeds moist during their germination, so remember to water the plants regularly.
Water the seedlings regularly throughout the growing season. They require about 1 inch of water per week for best growth.
Thin seedlings to 6 inches apart so that they have room to develop healthy leaves.
Once the plants are established, they do not need as much water per week. Keep them moist, but be careful not to overwater them.
Fertilize once or twice during the growing season with nitrogen fertilizer. Apply ¼ cup of fertilizer per 25 feet of row. Be sure not to over-fertilizer the plants.
To help prevent weeds, mulch around the plants as soon as they are visible above the soil. You can also till shallowly to help prevent root damage from weeds.