The list of plants that could be classified as blue is open to interpretation, but here are some of the more commonly available blue-flowered plants that are well suited to garden and landscape use.



Annuals

  • Annual lobelia (Lobelia erinus), full sun to partial shade, to 9 inches tall
  • Borage (Borago officinalis), full sun to partial shade, to 24 inches tall
  • Browallia (Browallia speciosa), partial to full shade, to 24 inches tall
  • Chickling pea (Lathyrus sativus), full sun, to 3 feet tall
  • Felicia (Felicia amoena), full sun, to 24 inches tall
  • Love-in-a-mist (Nigella damascena ‘Oxford Blue'), full sun, to 2 feet tall
  • Morning glory (Ipomoea tricolor ‘Heavenly Blue'), full sun, to 12 feet tall
  • Spanish bluebell (Hyacinthoides hispanica), full sun to partial shade, 16 inches tall
  • Texas bluebonnet (Lupinus texensis), full sun, to 12 inches tall

Bulbs

  • Chilean blue crocus (Tecophilaea cyanocrocus, Zones 7 to 9), full sun, to 4 inches tall
  • Flowering onion (Allium caeruleum, Zones 4 to 10), full sun, to 24 inches tall
  • Glory of the snow (Chionodoxa luciliae, Zones 3 to 9), full sun to partial shade, to 6 inches tall
  • Grape hyacinth (Muscari armeniacum, Zones 4 to 8), full sun to partial shade, to 8 inches tall
  • Hyacinth (Hyacinthus orientalis ‘Blue Jacket', Zones 5 to 9), full sun, to 12 inches tall
  • Lily of the Nile (Agapanthus campanulatus, Zones 7 to 10), full sun, to 48 inches tall
  • Quamash (Camassia leichtlinii, Zones 4 to 10), full sun to partial shade, to 54 inches tall
  • Siberian squill (Scilla siberica, Zones 5 to 8), full sun to partial shade, to 8 inches tall


Perennials and biennials

  • Amsonia (Amsonia tabernaemontana, Zones 3 to 9), full sun, to 24 inches tall
  • Bellflower (Campanula carpatica ‘Blue Clips', Zones 4 to 7), full sun to partial shade, to 10 inches tall
  • Blue bugloss (Anchusa azurea, Zones 3 to 8), full sun, to 5 feet tall
  • Blue-eyed grass (Sisyrinchium graminoides, Zones 5 to 8), full sun, to 24 inches tall
  • Catmint (Nepeta sibirica, Zones 3 to 8), full sun, to 36 inches tall
  • Chinese forget-me-not (Cynoglossum amabile, Zones 5 to 8), full sun to partial shade, to 24 inches tall
  • Fan columbine (Aquilegia caerulea, Zones 3 to 8), full sun to partial shade, to 24 inches tall
  • Common periwinkle (Vinca minor, Zones 4 to 9), full sun to full shade, to 8 inches tall
  • Corydalis (Corydalis flexuosa, Zones 6 to 8), partial shade, to 12 inches tall
  • Crested gentian (Gentiana septemfida, Zones 6 to 8), sun to partial shade, to 8 inches tall
  • Delphinium (Delphinium grandiflorum ‘Blue Butterfly', Zones 4 to 7), full sun, to 24 inches tall
  • Flax (Linum perenne, Zones 5 to 8), full sun to partial shade, to 24 inches tall
  • Forget-me-not (Myosotis alpestris, Zones 4 to 8), full sun to partial shade, to 8 inches tall
  • Globe thistle (Echinops ritro, Zones 3 to 9), full sun, to 24 inches tall
  • Himalayan blue poppy (Meconopsis betonicifolia, Zones 7 to 8), partial shade, to 48 inches tall
  • Hungarian speedwell (Veronica austriaca subsp. teucrium, Zones 6 to 8), full sun to partial shade, to 36 inches tall
  • Leadplant (Ceratostigma plumbaginoides, Zones 6 to 9), full sun to partial shade, to 18 inches tall
  • Lungwort (Pulmonaria angustifolia, Zones 4 to 8), partial to full shade, to 12 inches tall
  • Monkshood (Aconitum x cammarum ‘Bicolor', Zones 3 to 7), partial shade, to 6 feet tall
  • Mountain bluet (Centaurea montana, Zones 3 to 8), full sun to partial shade, to 18 inches tall
  • Nemesia (Nemesia caerulea, Zones 9 to 10; in cooler areas, treat as an annual), full sun, to 24 inches tall
  • Omphalodes (Omphalodes cappadocica, Zones 6 to 8), partial shade, to 10 inches tall
  • Pansy (Viola x wittrockiana, Zones 4 to 8; often treated as an annual), full sun to partial shade, to 12 inches tall
  • Perennial geranium (Geranium himalayense, Zones 4 to 7), full sun to partial shade, to 18 inches tall
  • Pincushion flower (Scabiosa caucasica, Zones 4 to 9), full sun to partial shade, to 24 inches tall
  • Sage (Salvia patens, Zones 8 to 9), full sun, to 24 inches tall
  • Siberian bugloss (Brunnera macrophylla, Zones 3 to 7), partial shade, to 18 inches tall
  • Virginia bluebells (Mertensia pulmonarioides, Zones 3 to 7), partial shade, to 18 inches tall


Shrubs and vines

  • Butterfly bush (Buddleja davidii, Zones 5 to 9), full sun, to 10 feet tall
  • Bluebeard (Caryopteris x clandonensis, Zones 6 to 9), full sun to partial shade, to 36 inches tall
  • Bigleaf hydrangea (Hydrangea macrophylla, Zones 6 to 9), full sun to partial shade, to 6 feet tall
  • Chaste tree (Vitex agnus-castus, Zones 6 to 9), full sun, to 25 feet tall
  • Lilac (Syringa vulgaris ‘Wedgewood Blue', Zones 4 to 8), full sun, to 22 feet tall
  • Passionflower (Passiflora caerulea, Zones 6 to 9), full sun, to 30 feet tall
  • Wisteria (Wisteria floribunda, Zones 5 to 9), full sun, to 30 feet tall