By law, a package of seed must be labeled with the Germination Rate. Example: 85%,, 97%, etc.
Hybred seeds are going to have a much higher germination rate than most heirlooms. That doesn't make the heirlooms bad,, it actually makes the produce grown from the Heirloom Seed more valuable.
What I meant by sterile, is sterile in the second generation. I can’t save seeds from the first generation. Those seeds either don’t sprout or they produce something strange. I don’t want seeds that have insecticides in them.