Plants that bloom in October in Zone 4 with blue flowers

Aster

The grand finale of the garden season. Essential for fall pollinators.

Big Bluestem

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

Morning Glory

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

Prairie Sky Switchgrass

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

Russian Sage

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