Cultivars
There are many cultivars available and you should contact your local nursery for the current available stock. Some of the cultivars are listed below.

'Acme'
This perennial grows to 750 mm (30 in) tall and produces pale lavender flowers during summer.

'Ethel Ballard'
This perennial grows to 6000 mm (24 in) tall and produces shell pink flowers during summer.

'Eventide'
 This perennial grows to  tall and produces violet blue flowers during summer.

'Gayborder Blue'
This perennial grows to 900 mm (3ft) tall and produces deep blue semi-double flowers during summer.

'Janet McMullen'
This perennial grows to 750 mm (30 in) tall and produces rose pink flowers during summer.

'Mrs George Munro'
This perennial grows to 900 mm (3 ft) tall and produces white flowers during summer.

'Peace'
This perennial grows to 900 mm (3 ft) tall and produces rosy-mauve flowers during summer.

'Patricia  Ballard'
This perennial grows to 900 mm (3 ft) tall and produces deep pink semi-double flowers during summer.

'Plenty'
This perennial grows to 900 mm (3 ft) tall and produces silver blue semi-double flowers during summer.

'Winston Churchill'
This perennial grows to 750 mm (30 in) tall and produces deep ruby red flowers during summer.

Dwarf hybrids
'Audrey'
This perennial grows to 300 mm (12 in) tall and produces pale pink semi-double flowers during summer.

'Lady H. Maddocks'
This perennial grows to 250 mm (9¾ in) tall and produces pale flesh pink flowers during summer.

'Little Boy Blue'
This perennial grows to 300 mm (12 in) tall and produces bright blue semi-double flowers during summer.

'Little Red Boy'
This perennial grows to 300 mm (12 in) tall and produces rosy red flowers during summer.

'Margaret Rose'
This perennial grows to 250 mm (9¾ in) tall and produces rose pink flowers during summer.

'Nancy'
This perennial grows to 250 mm (9¾ in) tall and produces silver lilac flowers during summer.

'Peter Harrison'
This perennial grows to 250 mm (9¾ in) tall and produces deep rose pink flowers during summer.

'Snowsprite'
This perennial grows to 250 mm (9¾ in) tall and produces white semi-double flowers during summer.