Love blue flower and looking for summer inspiration. 

Aconitum

African Lily

Floss Flower

Blue Star

Anchusa

Baby Blue-Eyes

Blue Daisy

Blue Potato Bush

Honeywort 'Purpurascens'

Blu Flag Iris

Blue Sage

Borage

Brachyscome 'Royal Blue'

Bugloss 'Loddon Royalist'

Cape Forget-Me-Not

Catananche

Californian Lilac

Cichorium

Clematis 'Arabella' (I)

Codonopsis

Collinsia

Dayflower

Common Flax

Larkspur

Blue Rock Bindweed

Cornflower

Creeping Phlox

Cyananthus

Field Bindweed

Field Scabious

Gentian Sage

Geranium 'Gerwat'

Gilia

Great Lobelia

Great Bellflower 'Hidcote Amethyst'

Green Alkanet

Hardenbergia

Hyssopus

Ithuriel's Spear

Jacob's Ladder

Kangaroo Apple

English Lavender 'Hidcote'

Lithodora

Lobelia 'Mrs Clibran'

Lobelia 'Sapphire'

Lobelia 'Waterfall'

Trailing Lobelia 'Cambridge Blue'

Meadow Cranesbill

Mealy Sage

Meconopsis

Mertensia

Morning Glory 'Star Of Yelta'

Morning Glory

Morning Glory 'Heavenly Blue'

Nepeta nervosa 'Blue Moon'

Love-in-a-Mist

Ornamental Onion

Parochetus

Patterson's Curse

Peach-Leaved Bellflower

Penstemon Heterophyllus 'Heavenly Blue'

Perennial Cornflower

Perennial Salvia

Phacelia

Phlox '21st Century'

Phyteuma

Pickerel Weed

Pincushion Flower

Potato Tree 'Glasnevin'

Pride Of Madeira

Queen's Wreath

Raceme Catnip

Rose Mallow 'Oiseau Bleu'

Salvia 'Black & Bloom'

Salvia 'Fairy Queen'

Meadow Sage 'Lyrical Blue'

Salvia patens 'Patio'

Siberian Iris

Viscid Nightshade

Stokesia

Tasman Flax Lilly

Tweedia

Speedwell

Victorian Blue Sage

Viper's Bugloss

Water Forget-Me-Not

Wisteria

Wood Iris

Blue Flowering Summer Plants

Although never fully deer proof - they are less likely to eat these. 

Yarrow

Allium

Juneberry

Snapdragon

Horseradish

Tarragon

Mugwort

Jack In The Pulpit

Wild Ginger

Asparagus

Aster

Astilbe

Barberry

Buddleia

Helleborus

Cacti

Pot Marigold

Caryopteris clandonensis

Dusty Miller

Cleome

Naked Ladies

Lily Of The Valley

Tickseed

Corydalis

Broom

Daphne

Bleeding Heart

Foxglove

Dryopteris marginalis

Purple Coneflower

Small Globe Thistle

Bluebell

Winter Aconite

Euphorbia marginata

Spurge

Blue Fescue

Crown Imperial

Snowdrop

Helichrysum

Heliotrope

Hyssop

American Holly

Ilex verticillata

Iris

Juniperus

Lantana

Lavender

Sea Lavender

Sweet Alyssum

White Horehound

Lemon Balm

Mint

Bergamot

Forget-Me-Nots

Bayberry

Daffodil

Catmint

Sweet Basil

Osmunda

Japanese Spurge

Paeonia

Papaver

Russian Sage

Alberta Spruce 'Conica'

Aniseed

Pine

Cinquefoil

Buttercup

Sumac

Rosemary

Coneflower

Ruta

Willow

Common Sage

Lamb's Ears

Lilac

Tansy

Teucrium chamaedrys

Thyme

Yucca

Viburnum dentatum

Zinnia

Deer Resistant Plants

Flowering plants that can be easily grown from seed.

Achillea

Alonsoa

Alyssum

Amaranth

Angelica

Aquilegia

Argentinian Vervain

Asarina

Bacopa

Brachyscome

Bupleurum

Calendula

Bellflower

Carnation

Cosmos

Dahlia

Foxgloves

Eccremocarpus

Echinops

Echium

Eryngo

Eschscholzia

Gaura

Giant Hyssop

Gypsophila

Hollyhock

Fantastic Flowers That Can Be Grown From Seed