surfinia and supertunia petunia
OK- I'm a novice at this. I've read that surfinia and supertunia can only be vegetatively propagated. Why? Are the seeds sterile? I have lots of each, which I like better than the many waves and would like to save some for next year. I've grown cuttings from the surfinia easily and they turned out great. But I don't have grow lights or anyplace to continue the cuttings through winter, (also will be gone for several vacations), so it would be great if I could save seeds for next spring.
So, are these seeds sterile, or is it just that saved seeds won't come true to form?
Thanks for any help.