Cultivars
'Alba Plena'
This vigorous perennial has bright green foliage that forms a rosette and during spring it produces fully double white flowers.

'Double Sulphur'
This vigorous perennial has sage green foliage that forms a rosette and during spring it produces fully double yellow flowers.

'Jack in the Green'
This perennial has bright green foliage that forms a rosette and during spring it produces single yellow flowers that are accompanied by leaf-like bracts.

'Ken Dearman'
This perennial has bright green foliage that forms a rosette and during spring it produces fully double orange flowers that are suffused in yellow and copper.

'Marie Crousse'
This vigorous perennial has bright green foliage that forms a rosette and during spring it produces fully double violet fragrant flowers.

'Miss Indigo'
This vigorous perennial has bright green foliage that forms a rosette and during spring it produces fully double rich purple flowers with whitish margins.