Answer: The best way to be sure to allow your coriander to set seed is to set aside a few plants and avoid harvesting them at all. They will then set seed and replenish the patch. However, coriander will normally "bolt" or hurry and bloom and subseqnetly set seed as soon as the weather turns warm. You will see slightly different looking growth emerging at the top of the plant and it will bloom shortly therafter. Allow the flowers to develop fully and dry out so they mature the seed within them.
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