You may want to try this:
(1.) find a well-mulched spot in your flower bed, clear a spot,oh, about the size of your hand, down to the dirt.
(2.) Loosen the suface of the dirt,sprinkle seeds on the loosened surface, and press them in, not quite covering them.
(3.) Replace mulch and mark the spot with a marker stake.
(4.) Check on them this coming spring. Replant the seedlings when they get a few inches high--
this could take all summer,or may even need a year, if they're like lilies and tulips I've seeded here.

Works for me. This is assuming it's not too late there to work the ground, like it is here.