Plants that bloom in October in Zone 3 with purple flowers

Aster

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

Dahlia

Endless forms from dinner-plate to pompom. The obsession of flower farmers.

Impatiens

The shade annual champion. Flowers prolifically where nothing else will.

Morning Glory

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

Petunia

Cascading color for containers and beds. Blooms nonstop until frost.

Sweet Alyssum

Honey-scented carpet of tiny flowers. The best living edging plant.

Zinnia

Easy-grow annual with electric colors. Cut-and-come-again champion.