Allium senescens

Allium senescens

Curley Chives, German Garlic, Ornamental Onion

Strelitzia nicolai

Strelitzia nicolai

Bird-of-paradise -tree

Lupinus polyphyllus

Lupinus polyphyllus

Big-leaved Lupine, Bigleaf Lupine, Blue Bonnet, Blue-pod Lupine, Bog Lupine, Common Lupine , Garden Lupine, Large-leaved Lupine, Lupin, Meadow Lupine

Yucca brevifolia

Yucca brevifolia

Joshua Tree, Palm Tree Yucca, Tree Yucca, Yucca Palm

Eryngium planum

Eryngium planum

Blue Eryngo, Flat Sea Holly, Flat-leaved Eryngium

Lavatera thuringiaca

Lavatera thuringiaca

Gay Mallow, Tree Lavatera, Tree Mallow

Iris versicolor

Iris versicolor

Blue Flag, Harlequin Blueflag, Larger Blueflag, Northern Blue Flag

Baptisia australis

Baptisia australis

Blue False Indigo, Blue Wild Indigo, Horse Fly Weed, Indigo Weed, Rattlebush, Rattleweed

Ipomoea tricolor

Ipomoea tricolor Heavenly Blue

'Heavenly Blue'

Heavenly Blue Morning Glory

Lobelia siphilitica

Lobelia siphilitica

Blue Cardinal Flower, Great Blue Lobelia

Centaurea montana

Centaurea montana Mountain Blue

'Mountain Blue'

Mountain Bluet, Perennial Cornflower

Iris missouriensis

Iris missouriensis

Rocky Mountain Iris, Western Blue Flag, Wild Blue Iris

Lavatera cachemiriana

Lavatera cachemiriana

Cashmir Mallow, Kashmir Mallow, Lavatera, Tree Mallow

Yucca elata

Yucca elata

Palmella, Soap Tree, Soaptree Yucca, Soapweed

Agastache foeniculum

Agastache foeniculum

Anise Hyssop, Blue Giant Hyssop, Lavender Hyssop

Ageratum houstonianum

Ageratum houstonianum dwarf Blue Mink

'Blue Mink'

Flossflower, Garden Ageratum

Clematis crispa

Clematis crispa

Blue Jasmine, Blue Jessamine, Curled Virgin's Bower, Curlflower, Curly Clematis, Marsh Clematis, Swamp Leather Flower, Swamp Leatherflower

Hosta ventricosa

Hosta ventricosa

Blue Hosta, Blue Plantain Lily, Hosta

Liriope muscari

Liriope muscari db

Big Blue Lilyturf, Lilyturf

Verbena hastata

Verbena hastata

American Vervain, Blue Vervain, False Vervain, Indian Hyssop, Swamp Verbena, Swamp Vervain, Vervain, Wild Hyssop

Viola sororia

Viola sororia

Butterfly Violet, Common Blue Violet

Campanula persicifolia

Campanula persicifolia

Peach-leaved Bellflower, Peachleaf Bellflower

Cyclamen hederifolium

Cyclamen hederifolium

Neapolitan Cyclamen , Sowbread

Echinacea angustifolia

Echinacea angustifolia

Black Samson Echinacea, Narrow-leaved Coneflower

Aquilegia caerulea

Aquilegia caerulea

Colorado Blue Columbine, Colorado Columbine, Rocky Mountain Columbine

Aconitum napellus

Aconitum napellus

Monk's Hood, Monk's-hood , Venus' Chariot

Cichorium intybus

Cichorium intybus

Chicory

Iris magnifica

Iris magnifica f. caerulea

var. f. caerulea

Blue Juno Iris

Knautia arvensis

Knautia arvensis

Blue Buttons, Field Scabiosa, Field Scabious

Lobelia siphilitica

Lobelia siphilitica Alba

var. Alba

Great White Blue Lobelia, White Cardinal Flower, White Lobelia

Helenium autumnale

Helenium autumnale

Bitterweed, Common Sneezeweed, Fall Sneezeweed, False Sunflower, Helen's Flower, Large-flowered Sneezeweed, Sneezeweed

Monarda didyma

Monarda didyma

Scarlet Beebalm