A strikingly better form of the species than the commonly available one. The flowers are a good strong clear blue and the stems, new shoots and leaf reverses are pure white. An easy but wide-spreading species - not for a small space. Flowering over a very long period from early spring into summer, it can be cut hard and will flower on the new shoots.
It is possibly a bit less hardy than the common form but I've found it easy and vigorous in a sunny dry spot, especially against a sunny wall