Cultivars
'Blue Stone'
This plant grows to 100 mm (4 in) with mid blue flowers.

'Blue Cascade'
This trailing plant produces blue flowers.

'Cambridge Blue'
This plant grows to 150 mm (6 in) with sky blue flowers.

'Colour Cascade'
This plant grows to 250 mm (9¾ in) with red, blue, mauve flowers. It forms trailing or pendulous stems. 

'Crystal Palace'
This plant grows to 120 mm (4¾ in) with intense blue with 
Purplish-green foliage.

'Emperor  William'
This plant grows to 100 mm (4 in). The flowers are compact and dark blue.

'Mrs. Clibran'
This plant grows to 200 mm (7¾ in) with deep blue with white eyes in the flower.

 'Paisley'
This plant grows to 150 mm (6 in) with all colours mix flowers.

'Rosamund'
This plant grows to 100 mm (4 in) with carmine rose with white eye in the flower.

'Sapphire'
This plant grows to 250 mm (9¾ in) with blue with white eyes in the flower. It has a trailing type or pendulous habit. 

'Snow Ball'
This plant grows to 100 mm (4 in) with pure white flowers. 

'String of Pearls'
This plant grows to 150 mm (6 in) with 6 separate colours and mixed coloured flowers. 

'Emperor  William'
This plant grows to 100 mm (4 in) with a compact habit and dark blue flowers.

'Mrs. Clibran'
This plant grows to 200 mm (7¾ in) with deep blue with white eyes in the flowers.