This annual in the Apiaceae family will produce shiny, smooth cilantro leaves in as little as 30 days. Or, let the plant go to seed and harvest the coriander seeds. The plant prefers full sun and regular garden soil. Sow seed directly into the garden in early spring, as soon as the ground can be worked. Barely cover the seeds, tamp well, and make sure the plant stays moist. Germination can be a bit spotty, especially in warmer soils. Sow starting in early spring, in successions three weeks apart in order to ensure ongoing availability of the fresh herb.