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Ground CoverApr-MayAjuga
Bronze-purple foliage with blue spikes. Fills bare shade in one season.
Z3-10
PerennialApr-MayAubrieta
Purple cascades spilling over walls and rocks in spring. Shear after bloom for a fresh flush of foliage.
Z4-8
PerennialMay-JunBlue False Indigo
Lupine-like spikes on a native that lives forever. Gets better with age.
Z3-10
PerennialMay-JulBlue Flax
Delicate sky-blue flowers open each morning on airy stems over fine foliage.
Z4-9
PerennialApr-MayBrunnera
Clouds of tiny forget-me-not blue flowers over heart-shaped leaves. Thrives in dry shade once established.
Z3-8
BulbApr-JunCamassia
Tall spikes of starry flowers rise above strappy foliage in late spring.
Z3-8
PerennialMay-SepCat's Meow Catmint
Tidy, dome-shaped habit that never flops open. Stays compact without shearing.
Z3-9
PerennialMay-SepCatmint
Billowy lavender-blue haze that blooms all season if you shear it back.
Z3-10
VineMay-SepClematis
The queen of flowering vines. Over 300 species, something for every spot.
Z3-10
PerennialApr-JunColumbine
Delicate, spurred flowers that dance on wiry stems. Hummingbird favorite.
Z3-8
Ground CoverApr-MayCreeping Phlox
An evergreen sun-loving groundcover that smothers walls, slopes, and rock gardens in dense pink, purple, blue, lavender, or white sheets every April and May.
Z3-10
PerennialMay-JunCulinary Sage
Spiky purple blooms above silver-green aromatic foliage. A kitchen herb that doubles as an ornamental.
Z4-8
PerennialApr-MayDwarf Crested Iris
Tiny lavender-blue iris flowers with gold crests on a spreading native ground cover. A spring woodland treasure.
Z3-9
PerennialApr-MayElliott's Bluestar
Pale blue starry flowers in spring give way to feathery foliage that turns brilliant gold in fall. Two seasons of beauty for zero effort.
Z4-9
BulbMar-MayGrape Hyacinth
Tiny grape-like clusters that spread into rivers of blue over time.
Z3-8
PerennialMay-JunIris
Elegant sword-leaved perennials with intricate, ruffled blooms.
Z3-10
PerennialMar-MayLungwort
Flowers open pink and turn blue on the same stem. Silver-spotted foliage looks great all season.
Z3-8
PerennialMay-JunLupine
Dramatic spikes in every color. Short-lived but self-seeds generously.
Z3-8
PerennialMay-JulNative Spiderwort
Three-petaled flowers in blue-purple open fresh each morning on a tough native that blooms for weeks and seeds freely.
Z4-9
PerennialMay-JulRocky Mountain Columbine
Large blue-and-white spurred flowers bloom in late spring above lacy foliage.
Z3-8
PerennialMay-JulRocky Mountain Penstemon
Spikes of deep blue tubular flowers rise above glossy evergreen foliage in early summer.
Z3-8
PerennialMay-SepSalvia
Vertical flower spikes that hummingbirds and bees cannot resist.
Z3-10
PerennialMay-AugSpeedwell
Tidy spikes of blue that add vertical punch to the front of the border.
Z3-8
VineMay-SepThe President Clematis
Big, rich violet-blue flowers with silvery reverse petals rebloom through the season on a vigorous, reliable plant.
Z4-9
PerennialMay-JunTrumpet Gentian
Intense, almost electric blue trumpet flowers on a low mat. The holy grail of alpine gardeners.
Z3-7
Ground CoverApr-JunVinca
Evergreen mat with periwinkle-blue flowers. Tough shade ground cover.
Z3-10
PerennialMar-MayVirginia Bluebell
Woodland ephemeral with sky-blue bells. Disappears by summer, returns faithfully.
Z3-8
PerennialMay-SepWalker's Low Catmint
Perennial Plant of the Year. Billowy lavender-blue spikes that rebloom hard after a shear.
Z3-9
PerennialApr-JunWild Blue Phlox
Loose clusters of sky-blue flowers float above woodland floors in spring on a fragrant, mat-forming native.
Z3-8