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Choose a flower pot or container that's at least 18 inches (45.7cm) wide and 8 to 10 inches (20.3 to 25.4cm) deep. Cilantro does not take kindly to being moved, so the pot needs to be big enough to contain the full grown plant. Fill the pot with some fast-draining soil. You can mix in some fertilizer too, if you like. Moisten the soil with a little water until it's just damp, not soggy. Sprinkle the seeds lightly over the soil to disperse evenly. Cover with another 14 inch (0.6cm) of soil. Cilantro needs full sun to grow, so place it in a sunny window-sill or conservatory. South-facing windows offer the most light and best growing conditions for cilantro. The seeds should germinate within 7 to 10 days. Keep the soil moist using a spray bottle to lightly mist the soil. If you pour water onto the soil, it might displace the seeds. Once the stems of the cilantro reach 4 to 6 inches (10.2 to 15.2cm) in length, it is ready to be harvested. Cut up to 2/3 of the leaves each week, as this will encourage the plant to keep growing. This way, it is possible to harvest four crops of cilantro from a single pot.
Select an appropriate pot. Plant the seeds. Place the pot in a sunny spot. Keep moist. Harvest the cilantro.