Generally speaking, flowers will create seeds, not bulbs. This is a form of sexual reproduction, so you'll (usually) need two plants, and the resulting plants will be genetically distinct from the parents. Bulbs are (also generally) from other bulbs that split into more bulbs. This is asexual multiplication, so the resulting plant is genetically identical to the single parent plant. For a great example of this, look at a garlic bulb some time. The individual cloves are more bulbs waiting to grow.
If someone else knows more and would like to chime in, that would be great. This is not a strong spot for me.
Algae creates 75% of the world's oxygen, so really we're all just doing our parts...