Plants that bloom in October in Zone 10 with blue flowers

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.

Morning Glory

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

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.