Coriander and cilantro come from the same plant. Cilantro comes from the leaves, and coriander comes from the seeds. It is an annual herb with small, green, feathery leaves. It produces pale pink or white flowers that blossom in clusters and can grow up to 20 inches (50 cm) high. It is planted every 2-3 weeks starting in late spring and harvested about a month later. Coriander essential oil is steam distilled from the seeds.