Plants that bloom in June in Zone 9 with blue flowers

Bachelor's Button

True cornflower blue that almost no other flower can match. Cottage garden classic that self-sows reliably.

Bird of Paradise

Sculptural, crane-like flowers in orange and blue. Unmistakable.

Blue False Indigo

Lupine-like spikes on a native that lives forever. Gets better with age.

Blue Flax

Delicate sky-blue flowers open each morning on airy stems over fine foliage.

Blue Oat Grass

Compact clumps of steel-blue blades provide year-round color and texture.

Borage

Star-shaped electric blue flowers that bees go absolutely wild for. Self-sows freely.

Butterfly Bush

Long, arching flower wands that butterflies absolutely lose their minds over.

Caesar'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.

Cat's Meow Catmint

Tidy, dome-shaped habit that never flops open. Stays compact without shearing.

Catmint

Billowy lavender-blue haze that blooms all season if you shear it back.

Clematis

The queen of flowering vines. Over 300 species, something for every spot.

Dutch Iris

Slender stems bear elegant iris blooms in late spring to early summer.

Endless Summer Hydrangea

Reblooms on old and new wood, so you get flowers even after a harsh winter. Color shifts with soil pH.

Hydrangea

Massive mophead blooms that shift color with soil pH. Showstoppers.

Iris

Elegant sword-leaved perennials with intricate, ruffled blooms.

Japanese Iris

Huge, flat, ruffled blooms up to 10 inches across. Needs consistent moisture, especially during bloom.

Larkspur

Tall spires of spurred flowers in deep blue and purple. The annual cousin of delphinium, easier to grow from seed and just as dramatic.

Lavender

Fragrant silver-green mounds beloved by bees and humans alike.

Lisianthus

Rose-like ruffled blooms with the vase life of a chrysanthemum. The flower farmer's secret weapon for high-end arrangements.

Morning Glory

Fast-climbing vine with trumpets that open fresh every morning.

Native Spiderwort

Three-petaled flowers in blue-purple open fresh each morning on a tough native that blooms for weeks and seeds freely.

Nigella

Sky-blue flowers wreathed in feathery green bracts give way to ornamental striped seed pods. Self-sows freely once you start.

Nikko Blue Hydrangea

The classic blue mophead. Rich, true blue in acidic soil. A cottage garden essential.

Pickerelweed

Spikes of violet-blue flowers above glossy arrow-shaped leaves. Native pond and stream bank staple.

Plumbago

Sky-blue phlox-like clusters bloom nonstop in warm climates. The blue flower that thrives where most blues melt in summer heat.

Salvia

Vertical flower spikes that hummingbirds and bees cannot resist.

Statice

Stiff papery flower clusters that dry to keep their color for years. A cut-flower farmer staple for wreaths and dried bouquets.

Stokes Aster

Fringed, shaggy-petaled flowers in shades of cornflower blue that bloom for weeks on a tough Southern native.

The President Clematis

Big, rich violet-blue flowers with silvery reverse petals rebloom through the season on a vigorous, reliable plant.

Triteleia

Loose umbels of starry blue trumpets on tall wiry stems. Western native bulb that thrives on summer drought.

Tuff Stuff Hydrangea

Reblooming mountain hydrangea with delicate lacecap blooms. Takes more cold than macrophyllas and keeps flowering after harsh winters.

Vinca

Evergreen mat with periwinkle-blue flowers. Tough shade ground cover.

Walker's Low Catmint

Perennial Plant of the Year. Billowy lavender-blue spikes that rebloom hard after a shear.