Coriander seeds are the seeds from a cilantro plant. Once the cilantro plant flowers and goes to seed, they can be collected and used in cooking or planting. Coriander seeds are common in East Indian and Mexican cuisine and can also be used in pickling brines.
Coriander Seed Usage
Typically the seeds are toasted and crushed or ground into a powder before adding to a dish. If you use a lot of fresh cilantro in your cooking, the seeds can be planted and placed in a bright/warm windowsill and watch them grow.