Grade #1 - Seed parent and pollen parent are known and there is absolutely no possibility that the seeds resulted from pollen contamination.
Grade #2 - Seed parent is known but several known staminate or hermaphrodite pollen parents are involved. Grade #3 - Pistillate parent is known and pollen parents are unknown.
Grade #4 - Neither parent is known, but the seeds are collected from one floral cluster, so the pistillate seed parent age traits may be characterized.
Grade #5 - Parentage is unknown but origin is certain, such as seeds collected from the bottom of a bag of imported Cannabis.
Grade #6 - Parentage and origin are unknown.
