Direct seed (recommended): Direct seed spring through late summer. Sow 1-2 seeds per inch, 1/4- 1/2" deep in rows 12-18" apart. There is no need to thin, as cilantro continues to grow well even when sown thickly. For coriander seed production, thin to stand 2-4" apart. Successive sowings can be done every 2-3 weeks for continual harvest of leaves.
LIGHT PREFERENCE: Sun. In most locations, bolting is likely in the heat of midsummer. Can be successfully grown in part shade in warm climates.


http://www.southernexposure.com/cilantro-coriander-1-g-p-971.html, Coriander sativum, Cilantro (Coriander), 1 g/90 seeds, X days, [depth], [area], "Difficult to germinate in hot weather - sow in shade, or keep soil covered and cool until seeds emerge. Self-seeds well in cool weather. Cold-hardy to 15°F. Germination: 60°F, dark required, 7-21 days. Direct seed. Full sun. 30 in. tall."
20170709 Tiny plant bolted and died.