Here is an entry from Mid America for one of their IBs, which illustrates what Joe says.
It's Amazing
$ 7.00
IT'S AMAZING (Black '12) Amazing color! Hot pink with tangerine to blue beards. Very short IB. In some areas it will be an IB and others SDB height with similar variation from season to season. By breeding it is a SDB. Rampantly vigorous. Makes instant, massive clumps. Priced the same as SDBs because of rapid increase. Early-Midseason 19" (48cm) Sdlg. Q115A: (Tickety Boo x (Spree x Cachet)) X Giddy pollen parent sib
This bloomed at an IB height for me this year. It was in very bright sun.
