I planted cheddar pinks dianthus at the end of the season last year. They were just tiny little plants with no blooms. This year they have flourished. Planted in full sun. I added a little organic matter to the soil when I planted. Only thing I've noticed is that the wind can really wreak havoc on them and they have a tendancy to get flattened out when stray basketballs find their way into my garden.
At the end of June, I sheared them back and now I see little pink blooms slowly coming back. Now if we only got a good rain - then I think they would really go!