Cilantro has a long taproot and does best planted from seeds. Cilantro grown from transplant often bolts more quickly than cilantro grown from seed. If you plant transplants, choose young transplants and handle the roots very carefully.
Plant cilantro seeds ¼-½ inches deep, 3-4 inches apart. Keep soil moist until the seeds sprout.
Cilantro grows in full sun, but needs partial shade in hot climate areas. Too much sun causes cilantro to bolt.
Parsley, dill, peas, and beans are good companion plants for cilantro.