Cultivars
'Alabaster'
This herbaceous perennial has a moderate growth rate up to 600 mm (2ft) tall and produces pale primrose-yellow flowers from mid-to-late spring.

'Cheddar'
This herbaceous perennial grows to 600 mm (2ft) tall by 450 mm (18in) wide and produces semi-double pale-yellow cup-shaped flowers during summer. It is commonly cultivated in a cottage gardens along borders in damp areas.  

'Earliest of All'
This herbaceous perennial grows to 500 mm (20in) tall by 400 mm (16in) wide and produces clear-yellow cup-shaped flowers during spring. 

'Feuertroll'  syn. 'Fireglobe'
This herbaceous perennial grows to 650 mm (26in) tall by 400 mm (16in) wide and produces rich orange-yellow cup-shaped flowers with a dark orange stamens during late spring. 

'Goldquelle'   syn. 'Gold Fountain'
This herbaceous perennial grows to 700 mm (28in) tall and produces yellow cup-shaped flowers from spring to early summer.

'Lemon Queen'
This herbaceous perennial grows to 600 mm (24in) tall and produces large pale-yellow cup-shaped flowers up to 70 mm (3in) wide from spring to early summer.

'Orange Princess'
This herbaceous perennial grows to 1m (3ft) tall by 500 mm (20in) wide and produces orange-yellow cup-shaped flowers during summer. 

'Taleggio'
This herbaceous perennial grows to 700 mm (28in) tall by 400 mm (16in) wide and produces large orange-yellow cup-shaped flowers during late spring.