After how much time do ground/powdered spices start losing their flavor?

  • After how much time do ground/powdered spices start losing their flavor? Aquarius_Girl

    Possible Duplicate:
    Shelf life of spices

    Suppose I grind the mustard + cumin + pepper seeds and keep them covered in a bowl, after how much time should I expect them to lose their flavor?

    Authoritative answers with references to some credible sources will be appreciated.

    EDIT 1:

    The packed powdered/ground spices we get in shops don't taste the same as freshly ground. Hence my question.

    EDIT 2:

    Info required for spices namely: Cumin, Mustard, pepper. and Garlic/Ginger too.

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