Not cultivator, Sarah...Cultivar. Now you'll have Bill thinking we're both crazy. lol!
A "cultivar" is a variety of a particular
plant that has been given its own identity. For instance,
rose of Sharon is the common name for the cultivar
Hibiscus syriacus, one member of the very large Hibiscus family.
I bet Bill can come up with a better definition but that should give you an idea of what I was talking about.
BTW, that is the same Phlox I have. I guess I never saw
seed pods due to deadheading so early.