Variety Maintenence: Step 1...Check your seed before planting.

[B. Copping]

Remove seeds that do not look like the majority.
They might be a different variety, cross, mutant, diseased, etc...

(Plant them separately if you like)

Sometimes what you buy off the seed racks can exhibit a great deal of "variety".
This can be fun, but not if you thought you were buying a cultivar, and plan on saving seeds.