Plants that bloom in August in Zone 9 with blue flowers

Anise Hyssop

Lavender-blue spikes with licorice-scented foliage. A pollinator powerhouse that blooms for months.

Big Bluestem

The signature grass of the tallgrass prairie, turning copper-bronze in fall with distinctive turkey-foot seed heads.

Bird of Paradise

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

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.

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.

Chaste Tree

Long lavender-blue spikes cover this heat-loving shrub all summer. One of the few shrubs that actually blooms in August.

Clematis

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

Endless Summer Hydrangea

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

Globe Thistle

Perfectly spherical steel-blue globes on white stems that dry to perfection. Bees are absolutely obsessed.

Great Blue Lobelia

Intense blue flower spikes that hummingbirds and bumblebees fight over in late summer. The bolder, taller cousin of cardinal flower.

Hydrangea

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

Lavender

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

Morning Glory

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

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.

Prairie Sky Switchgrass

The bluest foliage of any switchgrass, with airy pink seed clouds drifting above in late summer.

Rose of Sharon

A cold-hardy hibiscus shrub (Hibiscus syriacus) with big tropical-looking blooms in lavender, pink, blue, white, or wine, opening late summer when most flowering shrubs are done.

Russian Sage

Airy lavender clouds on silver stems. Thrives in heat and poor soil.

Salvia

Vertical flower spikes that hummingbirds and bees cannot resist.

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.

Walker's Low Catmint

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