Sorry that I have no advice for you, Lyn. But congrats on getting any seeds to sprout! The past couple of years that I've planted seeds, I've gotten NOTHING.
I'm considering putting just a few, very few, seeds into a 4" pot on top of my patio table this weekend. (I have to do it NOW because of the upcoming surgery.) Just leave it there, have DH or my garden helper lightly water it occasionally, and then see how that works out.
I've been able to sprout seeds before, obviously, so I don't know why the failures the past couple of years.
(I still have seedlings that I haven't seen bloom, because they've gotten too crowded, get a lot of shade, and have been neglected due to the various problems here. Maybe I can do something about them next spring.
Most of them will be whites, though...)