Cerinthe major var purpurascens

An annual from coastal Mediterranean areas, one of my unsung garden heroes for several reasons: 

--has blue bracts snuggling around the purple-blue flowers  There can never be too much blue in the garden.
--grows and blooms on little water--winter rain may be enough, though you get better and longer performance with some irrigation;
--reseeds, but is easily identifiable, has a small root system, and grows for quite a while before it blooms, so you have time to pull it before it gets out of hand;  
--the hummingbirds love the flowers.  The common name is "Honeywort";  the nectar must be honey-sweet because the hummers don't leave it alone, if they can find their way to it. 

Easy from seed--toss some around as the winter rains begin if you are in Southern California.  It makes a nice companion to the California Golden Poppy--the foliage has the same gray-green color as poppies, but with a different texture, and the blue-purple flowers complement the golden poppy blooms.