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AnnualMay-AugBachelor's Button
True cornflower blue that almost no other flower can match. Cottage garden classic that self-sows reliably.
Z2-11
PerennialMay-JunBlue False Indigo
Lupine-like spikes on a native that lives forever. Gets better with age.
Z3-10
GrassJun-JulBlue Fescue
Steel-blue tufted mound. Perfect edging or rock garden accent.
Z3-8
AnnualJun-SepBorage
Star-shaped electric blue flowers that bees go absolutely wild for. Self-sows freely.
Z2-11
PerennialMay-JunCaesar's Brother Siberian Iris
Tall stems hold rich violet-blue flowers above grassy foliage. The Siberian iris benchmark, blooming earlier and longer than bearded types.
Z3-9
BulbApr-JunCamassia
Tall spikes of starry flowers rise above strappy foliage in late spring.
Z3-8
PerennialJun-AugCampanula
Open, nodding bells in clear blue on tall graceful stems. Self-sows into refined cottage garden drifts.
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
PerennialJun-JulDelphinium
Towering spires of true blue. The tallest, most dramatic back-of-border plant.
Z3-8
PerennialApr-JunForget-me-not
Clouds of tiny sky-blue flowers carpet the ground in spring. Self-sows freely under shrubs and around tulips.
Z3-8
PerennialMay-JunIris
Elegant sword-leaved perennials with intricate, ruffled blooms.
Z3-10
AnnualMay-JulLarkspur
Tall spires of spurred flowers in deep blue and purple. The annual cousin of delphinium, easier to grow from seed and just as dramatic.
Z2-11
AnnualJun-OctLisianthus
Rose-like ruffled blooms with the vase life of a chrysanthemum. The flower farmer's secret weapon for high-end arrangements.
Z2-11
PerennialMay-JunLupine
Dramatic spikes in every color. Short-lived but self-seeds generously.
Z3-8
AnnualJun-OctMorning Glory
Fast-climbing vine with trumpets that open fresh every morning.
Z3-10
PerennialJun-AugMountain Bluebell
Sky-blue bell flowers on tall arching stems along mountain streams. The showy western cousin of Virginia Bluebell.
Z3-7
AnnualMay-JulNigella
Sky-blue flowers wreathed in feathery green bracts give way to ornamental striped seed pods. Self-sows freely once you start.
Z2-11
PerennialJun-SepPickerelweed
Spikes of violet-blue flowers above glossy arrow-shaped leaves. Native pond and stream bank staple.
Z3-10
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
AnnualJun-SepStatice
Stiff papery flower clusters that dry to keep their color for years. A cut-flower farmer staple for wreaths and dried bouquets.
Z2-11
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
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