Cultivars
'Boothman's Variety'
The spreading perennial produces violent pink flowers with dark eyes and is grown in rockeries for colour contrast.

'Crackerjack'
This compact perennial grows to120mm (4¾in) tall by 200mm (7¾in) wide and produces reddish magenta flowers during spring.

'Iceberg'
This perennial as a spreading habit and produces white flowers that may be tinged in blue. They appear from late spring to early summer and planted in rockeries or in containers.

'Red Admiral'
The perennial produces deep crimson flowers from spring to early summer and forms a compact spreading habit.

'Rosea'
This evergreen perennial grows to 100 mm (4in) tall by 300 mm (1ft) wide forming a spreading a mound habit with a dark green narrow lanceolate foliage.  From late spring to early summer it produces abundant pink saucer-shaped flowers and is ideal for a rockery or alpine bed and between paving.  It prefers an open sunny position and grows on well drained dry to moist sandy soils with a neutral pH in zones from 3-8.

'Tycoon'
This cultivar has a spreading habit and produces white flowers. It is garden origin and is commonly planted in rockeries as a spillover or ground cover.

'Violet Queen'
This perennial forms a compact habit and produces deep Violet purple flowers during late spring.  It grows to a height of 100mm (4in) and spreads to 150mm (6in) wide.

'Waterloo'
This perennial produces crimson flowers during spring and has a spreading habit.