It might not "go bad" as a week-old banana would, for instance, but with the possible exception of salt, which if kept dark and dry is virtually unchanged for centuries, almost all spices and herbs lose their "punch" and become ineffective after about two years, even if stored properly.
The price of coriander can be effected by the available supply. If there has been a bad growing season, there will be less coriander, driving prices up.
Coriander
Coriander = "Malli" (மல்லி) Coriander Power = "Malli Podi" (மல்லிப்பொடி)
Americans call coriander leaves "coriander" or "cilantro."
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coriander seeds
6 grams of coriander seeds =how mady grams of coriander powder
Sift the coriander powder using a fine sieve. The fine powder will fall through the holes in the sieve and the seeds will not.
ganyen coriander
Yes, you can safely freeze coriander.
Coriander in Hindi is "dhania."
One teaspoon coriander seeds equals one teaspoon ground coriander. http://www.greenearthinstitute.org/recipes/coriander_seed/about_coriander_coriandrum_sativum.html