Plants that bloom in October in Zone 9 with blue flowers

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.

Butterfly Bush

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

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.

Plumbago

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

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.

Tuff Stuff Hydrangea

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