Green strappy leaves, sometimes with a hint of blue.
The flowers range in colour from pure white to richest blue, some are huge showstoppers, others smaller but more plentiful.
All are excellent in pots and will flower for many years. Pots are best taken into a frost-free environment (greenhouse or conservatory) for the winter.
They will also grow well in a sheltered spot in the garden given some protection in the colder months of the year.