Cultivars
'Aurea'
This plant has lime green to golden leaves otherwise it is the same as the species. It is planted in borders and has a medium water requirement once established. (Scale: 2-drops from 3)

'Baby Blue' 
This dwarf plant grows to 250mm (10in) tall forming a compact habit with dark green foliage. It produces fragrant purple-mauve flowers during spring and grows in a semi shade. It prefers a well drained fertile soil and is drought and frost tender. It is planted in low borders or is ideal for patio pots and hanging baskets. It has a medium water requirement once established. (Scale: 2-drops from 3)
 
'Chatsworth'
This vigorous plant has strongly scented flowers that are bright deep purple and is excellent for cottage garden borders.

'Iowa'
This plant forms a compact habit with blue tinged deep green leaves and deep purple flowers.

'Lord Robert'
This compact plant has purple-green leaves and violet-blue flowers.

'Princess Marine'
This compact plant produced strongly scented violet blue flowers.

'Regal Dwarf'
This very compact plant produces large dark blue scented flowers.

'White Lady'
This plant has a compact habit and produces white flowers that are tinged pink in bud.