In this area, people usually mean the plant descended from Dianthus barbatus when they say Sweet William. Phlox belongs to the family Polmoniaceae, whereas Dianthus belongs to the family Caryophyllaceae.
Common names also serve a purpose, if only that they feel good and are fun, but they are actually useful. Even though we have two different plant families here, neither of us has seen this plant, and we don't know its habits. It could indeed be creeping or erect, but without more information, we won't know by a post. So if a common name happens to describe this trait in a manner more understandable in the language of the locale involved, it has justified its use. Taxonomists continually change classifications, but my grandmother and her friends and their descendants still use the same name through the years. And we all know what is meant when we use those familiar terms in our areas. Yes, botanical names are good from a scientific point of view, but they, too, have limitations when you look at their practical place in the ordinary gardener's life. So, using your advanced knowledge of plant classification, which plant does Vic have, Polemoniaceae or Caryophyllaceae?
Yes I know what you mean but you know - think how easy place world is for english speakers. I mean as a 'mother tongue'. Common names are then much more easier for you to use, would it be nice if I'd use just Finnish names from now?
So, I think the plant in the photo belongs to neilikkakasvit, because sinilatvakasvit look different.
I agree with Poppysue and Aimee. Mine aren't blooming yet, but I'm sure they are Dianthus Barbatus or Sweet William. The unopened flower head looks right to be Sweet William. I also agree that there is a time and a place for the use of common names. I know that I would not be able to id some of my stuff it all you guys talked using botanical names only. I also understand Everts comments, but for the most part, we are English speaking people and learning Finnish would be a silly expectation. I think that a little give and take...common and botanical...is the only way to go.