Sub-species
subsp. albiflorus
This plant produces white or purple flowers.

Cultivars
There are many cultivars of this plant contact your local nursery for available varieties.

'Flower Record'
This perennial produces pale violet flowers during spring.

'Haarlem Gem'
This perennial produces lilac flowers that are silvery-grey on the outside during spring.

'Jeanne d'Arc'
This perennial produces white flowers with a deep purple base during spring.

'Pickwick'
This perennial produces white flowers that are stripped pale and dark lilac with a dark purple base during spring.

'Purpureus Grandiflorus'
This perennial produces violet flowers with a purple base during spring.

'Queen of the Blues'
This perennial produces lilac-blue flowers during spring.

'Remembrance'
This perennial produces shiny violet flowers during spring.

'Striped Beauty'
This perennial produces pale lilac flowers with a dark purple base during spring and has variegated leaves.

'Vanguard'
This perennial produces pale lilac flowers that are grey outside during autumn.

'Yellow Empress'
This perennial produces yellow-orange flowers during spring.