Here is a list of blue plants for Seattle, the Pacific Northwest & USDA Zone 8. Use it to find blue flowers & plants with blue, gray or silver foliage. Blue is soft & soothing. Most blue foliage is somewhat gray. Blue-gray foliage often has a fluffy, feathery look. Blue & gray look very handsome with red, contrast nicely with yellow. Blue flowers work well with gray foliage, because there is just enough contrast to make them visible, yet they also blend nicely.
Purple,
pink & white flowers go well with blue. Blue is calm & accepts diversity. Many plants with blue-gray & gray foliage have yellow or white flowers. Blue-gray, gray & silver foliage are tasteful additions to a
white garden, especially when these plants have white flowers. Plants with blue-gray or gray foliage & yellow flowers are perfect for a blue &
yellow garden, an arresting combination. The terms glaucus, glauca & glaucum mean that the plants have a fine, whitish, powdery coating, usually on the leaves, but fruits can also be glaucus. Xeric plants don't usually need irrigation. This list is meant to introduce you to these plants & give basic information. Further research will be needed to find sizes & specific horticultural requirements.
Trees: all for sun
Sequoia sempervivum ‘Filoli’ (Coast Redwood): blue foliage, large evergreen conifer
Shrubs
Elaeagnus commutata (Silverberry): silver foliage, silver fruit, small yellow flowers, sun, xeric.
Rosa glauca: blue foliage with pink tinge, pink flowers, sun.
Senecio greyi (aka Brachyglottis 'Sunshine'): gray foliage, yellow flowers, evergreen
Perennials: all with blue flowers, except as noted
Groundcovers & Trailers
Ajuga reptans (Carpet Bugle): many cultivers, blue flowers, sun or part shade.
Sedum anacampseros: blue-green foliage, pink flowers, sun;
Sedum dasyphyllum: blue-green foliage, pink flowers, sun;
Sedum forsterianum: blue-green foliage, yellow flowers, shade or part-shade;
Sedum obtusatum: blue-green foliage, cream flowers, sun;
Sedum oregonense: blue-green foliage, yellow flowers, sun;
Sedum reflexum 'Blue Spruce': blue-green foliage, yellow flowers, sun; all xeric.
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