What is the blue tag and white tag on a seed bag and which should I buy?

The tag colour tells you the class of the seed. A blue tag means certified seed, produced from foundation seed and inspected and tested by the State Seed Certification Agency; this is the right choice for almost all farmers growing a normal crop. A white tag means foundation seed, an earlier and purer class mainly meant for seed growers who will produce certified seed, and it usually costs more. There is also a golden or yellow tag for breeder seed (the institute's original stock) which farmers do not normally buy, and truthful label seed sold under a company's own opal/label without an agency tag. For your sowing, pick the blue tag (certified). Make sure the tag is properly stitched on, the lot number matches the bill, and the test/validity date has not passed. If you are confused about a tag in front of you, ask the dealer or your KVK before paying.