Blue flowering & good on sunny slopes & drought tolerant?

Do you have a blue favorite? The terraces are red clay HEAVILY ammended with mushroom compost with superior drainage lots of sun and the plants should be fairly HARDY and tolerant of a little bit of neglect the second year after being established.

I have a LOT of slope to fill and already have plenty of whites, yellow/oranges, and red/purples. LOTS of those. But am leaving spaces for the blues.

For instance:

Russian Sage
Petunias even if they are annuals
Siberian Iris
German Iris
Blue foliage would work too

Any thing you love that could fill in this list? Thanks!

I love hardy Agaves like A. parryi and its subspecies. I also love the "annual" Salvia farinacea since it winters over for me. Nepeta 'Walker's Low' or similar (not pictured) could also be nice.

Ooo, thanks for the suggestions!

Maybe Lithodora?

http://www.google.com/search?q=lithodora&hl=en&client=firefox-a&hs=yXF&rls=org.mozilla:en-US:official&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=h7r_T8SFIMHTrQHglcS8Bw&ved=0CFsQsAQ&biw=1366&bih=663

Oh, lithodora is lovely! That's a new one on me but I'm ordering seeds. THANKS, shune.

I also love Nepeta 'Walker's Low' (and so do the butterflies, bees and, sometimes, hummers) I don't know if I have a good picture, but "Plant Files" should have bunches. I found a plant I thought was very pretty on Bluestone Perennial's "plant finder" by entering some of the conditions you mentioned (they didn't list "slope"). However, I have no personal experience with it.

The link to the picture and info is below, with a link under the photo to enlarge it. It's kind of expensive, though. It happens to be a trademarked plant so I don't know if you can get seeds. If you can wait until Spring, Bluestone starts discounting plants and in May they have a season-end blowout with almost everything on the website at half price!

The "plant finder" is a really good way to find plants by entering your needs. There's no obligation to buy anything. I use it all the time. Sometimes if it's off-season, though, the selection to look at may be somewhat limited.

http://www.bluestoneperennials.com/ERSB.html

If I think of any others, I'll let you know. I bet it's going to be beautiful when you get it finished!

THANKS, Nuts, , I have 4 of the Walker Lows and like them a lot, foliage and flowers. They are ready to go in the ground in the next couple of days.

If I only had a couple of yard slaves or yard 'bots, I'd have a lot more done a lot faster building terraces. ! Hahaha, but then I wouldn't know where every shovel-ful went and how each bed was made, down to the last grain of soil.

I have extra agave parryi truncata pups if you would like a few.
They are really a nice "grey" color.
How about "hardy blue plumbago"?
I don't grow this one but the other plumbagos I grow are lovely plants.