Bachelor's Buttons

Balloon Flower 

Baptisia 

Beardtongue 

Bee Balm

Beeblossom

Belamcanda

Bellflower

Bergenia

Betony

Big Bluestem 

Black-Eyed Susan 

Blackberry Lily

Blanket Flower

Blazing Star 

Bleeding Heart 

Bloodroot

Bloody Cranesbill

Blue Boneset

Blue Flag

Blue Vervain

Bluebells

Blue Mist Flower

Bluestar

Bluet

Breckland Thyme

Brunnera

Bugloss

Burnett

Burning Bush

Butterfly Weed

Button Aster

Button Blazing Star

Astra Pink: Walters Gardens
a. minor: Chanticleer Garden, CC2 via Flickr
Jack Frost: Walters Gardens
Fairytale Romance: Walters Gardens