Beautiful azure blue flowers on this silver-leaved plant.  Good plant for sunny, well-drained spot.  Not as hardy as the species, but if well-drained and in a sheltered position will see itself through a moderately cold winter.  Well worth the effort. 

Also good for patio pots, which can be taken away from winter wet.
N.B.
Untouched by frost and snow so far (14/1/21) this year and for the past three winters, so hardier than one would imagine.