Hi Terri,
Resist the temptation to pick them, lol! The ones falling off may be seeds that didn't get fertilized. One that aren't fertilized are tiny and not plump at the base. I wish I had a pic! I'll try to remember tomorrow while it is light out after I get home from work. Anyway, one thing you can do is bag them. Those little sheer party favor bags work nice, old pantyhose too.
Remy

Thanks, Remy! I know what you mean by being plump at the base... I didn't consider that the "fallen ones" might have been infertile. I'll have to look around and see if I find more of those still hanging on just to see what they look like on the vine. Typically when have you harvested yours?

Hi Terri,
Ok, I'm glad you know what I mean. Often people save the seeds not realizing that sometimes they never got fertilized. It is odd too, some varieties seem to have lots of ripe seeds while others have hardly any. I just collected seeds of one variety that blooms fairly early. I'm watching another that blooms a bit later. They are almost ready. My sweet autumn is just a baby, so I don't know about it in particular.
Remy