I was going to suggest sage, rosemary and thyme until you said nasturtiums, which don't seem likely to combine well with those.

Lavender is also a great blooming medicinal, though I have trouble keeping them looking like a neat mound. The Spanish lavender in particular has nice flowers. California poppy will reseed here and come back year after year. Fennel, anise, and dill are annuals but liked by butterflies. Lovage is a perennial or biennial.

If you have room for vines you can plant the runner bean, which has red flowers that attract hummingbirds, and beans that can be eaten as snaps when young or as shellies when mature. Some perennial medicinal vines include Schizandra chinese, Polygonum multiflorum (Fo Ti or Ho Shu Wu), and Hops, Humulus.

Tough perennials- Lady's Mantle, Alchemilla, will reseed freely, very freely, and can be used as a tea, as can Achillea millefolium (yarrow).

The PNW has lots of "weed" medicinals too, like Self-heal, Prunella, which has been developed into named varieties; Cleavers; Ribwort Plantain; Stinging Nettle; Red Clover; even the lowly dandelion. Of course they grow and multiply like weeds.:-)

Here is a link I googled, in Seattle.

Here is a link that might be useful: Butterfly herb garden

Speaking of weeds...

Here is a link that might be useful: Common Fennel

Good site, bboy. The fennel on sale at local seed racks, like Ed Hume and Lily Miller, are the bulbing kind of fennel that is a reccommended alternative.

Penstemon, hardy Fuchsias like David, and Phygelius have red flowers that appeal to hummingbirds, but I think none of my Phygelius survived this last winter.:-(

here are a couple plants i have been loving lately.

if you are watering:

helianthus tuberosus. edible tuber, great flowers.

sanguisorba minor. cucumber tasting herb. fruit salads. try it in chilled red wine!

anthriscus sylvestris 'ravenswing'. sharp flavored edible leaves. amazing foliage.

perilla frutescens 'Akashiso'. also great foliage. try it in stir fries.

if you are not watering much:

clinopodium douglasii. tea. sprawling.

prostanthera rotundifolia. tea. upright flowering.

billardiera longiflora. twisting climber. edible fruits. flowers.