Just try some now, and some next spring after storage at ambient temperature now, followed by storage at lower temperatures during winter. The offspring of a hybrid will show some variation in respect to its parent. I am yet to try this with my Garden Gladioli like "Priscilla" which is my favorite, with frilly flowers.

If the seed are viable they should sprout fairly quickly. Try them between damp paper towels in a plastic bag at room temperature and you should have sprouts within two weeks.

Thanks, I appreciate the help. 'Carolina Primrose' is supposed to be an early primulinus hybrid, so I guess they will be surprise offspring if the seeds sprout. I've never done Gladiolus seed before, so I'm not familiar with what normal seed looks like. These looked kind of puny, but I'll just give it a shot and see what happens.