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.