Posted: 11/09/2013 at 17:39
They sound terribly small for 4 years old. I grew P. Katrina from a cutting takeb 2 years ago and that is over 6 feet tall already and good and bushy too. Had a few flowers this year and plenty of new growth for flowers next.
To be honest I think they may well be too root constricted in a pot, they do better in the garden where the roots can sprad out.