There are many cultivars of the species and it is advisable to contact your local nursery for available varieties.

Cultivars 
'Appleblossom'
This perennial has large pale pink flowers that become deep pink with age.

'Cantata Lavender'
This perennial is similar to the species and produces lavender blue flowers.

'Queen of the Market'
This is a low growing perennial grows to 200 mm (6in) tall and produces red-pink flowers.