This hardy shrub will not bowl you over, but it does have quiet charm.
It is easily grown but seemingly by very few people. It is the plant I am most often asked about here when it is in flower. Many horticultural boffins are defeated by it!
A bushy shrub up to 10' high and best grown against a sunny wall. It survived last winter in Kidderminster but has not yet been tested by a really nippy one!
The white-blue pea like flowers last for some time and the leaves can be made into a refreshing drink! (Known in Peru as the Jesuit's tea tree!)