At our Central Florida nursery we find very upright growth with blooms of about 1/2" diameter. Grows very well in heat. Plant shown has been growing in daytime temperatures of 100-110 degrees Fahrenheit. in our greenhouse. The heat does not seem to have a negative affect on flowering. The height of 24-30" would be a good range from what we have observed. Blooming is continuous from our experience.
When seeing this each morning I have a constant reminder of the significant work that Ruth Knopf has contributed.