Cultivars
There are many cultivars, please contact your local nursery for available varieties. 

Tall strains grow to 70 to 80 cm
'Californian Giants'
'Dahlia-flowered'
'Gold Medal'
'Brilliant Giants'
'Scarlet Ruffles'

Medium grows to 50 to 60 cm (2ft)

'Burpeeana Super Giant'
'Carousel'
'Envy'
'Fantasy'
'Fruit Bowl'
'Sprite'

Dwarf cultivars grow to 20 to 45 cm (18in)

'Buttons'
This plant grows to 30 cm (1ft).

'Lilliput'
This plant grows to 45 cm (18in).

'Peter Pan'
This plant grows to 30 cm (1ft)..

'Tetra Giants'
This plant grows to 15 cm (6in).

'Tetra Ruffled'
This plant grows to 15 cm (6in).

'Thumbelina'
This plant grows to 15 cm (6in).