Aquilegia canadensis L.

Canadian Columbine, Eastern Columbine, Eastern Red Columbine, Red Columbine, Wild Columbine

Aquilegia chrysantha A. Gray

Golden Columbine

Aquilegia flavescens S. Watson

Yellow Columbine

Catananche caerulea L.

Lonicera caerulea L.

Blue Honeysuckle, Haskap, Honeyberry, Sweetberry Honeysuckle

Ageratum sp 'Blue Mink'

Blue Mink Ageratum

Aquilegia formosa Fisch. ex DC.

Western Columbine

Centaurea montana 'Mountain Blue'

Mountain Bluet, Perennial Cornflower

Hosta sp 'Blue Umbrellas'

Blue Umbrellas Hosta

Hosta sieboldiana 'Big Blue'

Big Blue Hosta

Hosta sieboldiana 'Blue Mammoth'

Blue Mammoth Hosta

Iris sibirica 'Blue'

Siberian Iris

Pseudotsuga menziesii var. glauca 'Deep Mountain'

Deep Mountain Douglas Fir

Sambucus caerulea Raf.

Blue Elderberry

Abies balsamea 'Improved' New Hampshire Blue

Blundell Blue Balsam Fir, New Hampshire Blue

Aquilegia caerulea E. James

Colorado Blue Columbine, Colorado Columbine, Rocky Mountain Columbine

Ipomoea tricolor 'Heavenly Blue'

Heavenly Blue Morning Glory

Passiflora caerulea L.

Blue Passion Flower, Bluecrown Passionflower, Common Passion Flower