If you are looking to purchase cilantro seed (also known as coriander seed) then you are in luck as cilantro seed is part of the regular range of salads and herbs at the 'Seeds of Eaden' seed shop. Native to the subtropical climates of southern Europe and North Africa onwards to southwestern Asia, it is surprisingly cold tolerant and will grow quite happily as a garden herb in northern European gardens.
Cilantro will require a light, free-draining soil that has been raked over to produce a fine tilth. Sow the seed thinly at a depth of ½ inch in rows 12 inches apart. If the soil is dry then water first before sowing. You can expect the seedlings to emerge between 1 and 3 weeks depending on how warm the weather is. Thin out to every 3 inches if you want a supply of fresh leaves, and every 9 inches if you want to harvest seeds Sow every few weeks to provide a succession of fresh leaves through out the year.
Harvest leaves once the plants reach between 4-6 inches tall