Shorter than the Spectabile forms - the Formosa type is better suited for ground cover
Formosa comes from the feminine form of the latin 'formosus'  -  'finely formed, handsome, beautiful'., which describes this perfectly
LONG FLOWERING - from April to August in the corrct setting
not fussy for soil or position, but semi-shade for best results
Flower height to only 40cm, but spread to 75cm