Sometimes there aren't enough natural factors to pollinate the bloom.  Seeds won't form without this taking place.  It's easy to do....just pick one of the anthers that have the yellow pollen, and rub it on the stigma right in the center of the flower.  This should give you a seed pod for each one you pollinate.

http://www.enchantedlearning.com/subjects/plants/printouts/floweranatomy...

 Good luck getting seeds, Dizzy!!