Cultivars
'Alba Coronata' and 'Alba Plena'
This perennial grows to 450 mm (18 in) tall and produces semi-double flowers that have enlarged petaloid stamens.

'Boule de Neige'
This perennial grows to 600 mm (24 in) tall and produces double white flowers that appear during early summer.

'Fleur de Neige'
This perennial grows to 700 mm (28 in) tall and produces large shallow cup shaped white flowers that have petaloid stamens.

'Pride of Exmouth'
This perennial grows to 600 mm  (24 in) tall and produces semi-double purplish blue flowers that appear during midsummer.

'Telham Beauty'
This perennial grows to 900 mm (3 ft) tall and produces like blue flowers that are up to 70 mm (2⅔ in) wide and appear from early summer to Midsummer.