Pacific Northwest Gardening: Looking for the bluest blue flowers, still, 1 by neofarmer

neofarmer wrote:
I remember asking this last year, and got some great plants that hopefully have survived the winter, like my exquisite blue woodland poppy. My Tweedia looks dead at this point, but I did save the seeds. I have several clumps of Salvia Patens and they are my favs. Hopefully they made the hard freezes.

Here is a list of plants that I am thinking about and wonder if anyone has experience with them, and just how blue they really are. I do not want purple blues, but more true blues, sky blues, etc. My bright blue bachelor buttons did not appear last year, only some pink and light blue, was wondering if the seeds don't stay true? Also throw out any other great killer blues you know of.

ANCHUSA Dropmore
ASTER Bluebird
CAMPANULA Blue Clips
CAMPANULA persicifolia New Giant
CENTAUREA montana Gold Bullion
DELPHINIUM grandiflorum Blue Butterfly
ECHINOPS Platinum Blue
PLATYCODON Mariesii
SAMBUCUS racemosa Sutherland Gold
VERONICA Darwin's Blue
VERONICA Goodness Grows
VERONICA Teucrium Crater Lake Blue
VERONICA teucrium Royal Blue
agnus-castus ABBEVILLE BLUE