True-Blue Flowers: A Dozen Of The Best And Brightest

Himalayan Blue Poppy at Pennsylvania’s Longwood Gardens/Kari Wilner

Years ago, in an effort to distract my middle-school aged daughters, I dragged them to an avant-garde exhibit at Washington, DC’s Hirshhorn Museum. The show was a one-color retrospective on the works of the French artist, Yves Klein (1928-1962) and it focused on the color blue; specifically, a supersaturated deep blue created by Klein that made you feel like you had been sucked out to sea and were drowning. Needless to say, it left an indelible impression on all of us.

The exhibit was accompanied by Klein’s commentaries on the role he believed blue played in our lives. He wrote:

“All colors are associated with concrete ideas whereas blue calls to mind first and foremost the sea and the sky, that which is the most abstract in tangible, visible Nature.”

Klein likened blue to an open window. He believed that the color blue defined the very edges of our visible reality. Think about it – do the sea and sky have any distinguishable boundaries? Maybe this is why what lies behind or beyond these two constants in our world has been the subject of speculation for centuries.

In Klein’s view, blue distinguished what was visible while expressing what was not. To illustrate this idea, he worked with a chemist to develop his own brand of blue. Introduced in Milan in 1957, the supersaturated ultramarine pigment took the world by storm. It came to be known as International Klein Blue (IKB).

Yves Klein Blue Monochrome 1961

The hardest to see

Due to its shorter wavelengths, blue is a harder color for the eye to see. This, coupled with the proximity of blue to the end of the visible spectrum, may explain why for centuries blue color has symbolized that which is mysterious or unknown.


So what role can blue play In the garden? Does it inject the same abstract note, evoking a sense of wonder and mystery? Or does our difficulty in discerning it add an important structural element to our compositions? The answer is all of the above.

Bigleaf hydrangea and Blue coleus, Plectranthus thyrsoideus

Blue and perspective

When it comes to perspective, ‘hot’ colors seem to move forward in space while ‘cool’ colors appear to recede. As a cool color, blue can add depth and volume to a composition where it often appears more as an ‘impression’ than as a discernible flower.

Nepeta ‘Walker’s Low’ appears as a blue ‘haze’ in this garden

Blue harmonies

Blue flowers form pleasing harmonies with pink, apricot, butter cream and violet blooms, where they help to add volume to a composition.

Blue and apricot make a pleasing harmony

Blue contrasts

On the other hand, when paired with yellows and whites, blue flowers provide contrast, helping to point up the brighter colors.

The blue hydrangeas make the white orchids ‘pop’

Blue/purple compositions

Many blue flowers tend toward a purple/lavender tint. Combining blue with purple blooms makes for a restful composition. I like to inject a note of bright green to liven up these peaceful garden spaces.

A blue and purple garden


Following are some outstanding blue flowers, all photographed at Longwood Gardens’ spectacular ‘Winter Blues’ exhibit on view now through the end of March. See if some of them don’t work in your own garden!

Himalayan blue poppy, Meconopsis ‘Lingholm’:  A hybrid perennial poppy that produces large, sky blue blooms in late spring. Likes partial shade and grows to a height of between 3 and 4 feet.

Himalayan blue poppy ‘Linghom’

Hydrangea macrophylla ‘Nikko Blue’ is a great shrub for the semi-shade border, big blue blooms in early summer. Blooms on old wood.

Hydrangea macrophylla ‘Nikko Blue’

Blue Coleus, Plectranthus thyrsoideus, also known as Bush coleus, is a member of the mint family. Originally from Africa, it is grown primarily as an annual in our area.

Blue coleus

Blue Flax, Heliophila coronopifolia, is a delicate blue daisy grown as an annual in full sun.

Blue flax (a little more purple than blue)

Blue Daisy, Felicia amelloides ‘San Gabriel’ produces blue, daisy like flowers from summer to autumn. Grow in full sun.

Blue daisy

Muscari aucheri ‘Blue Magic’, also known as grape hyacinth produces fragrant, true-blue flowers in late spring. Best naturalized in large groups in full sun. Plant bulbs in fall.

Muscari ‘Blue Magic’

Portuguese squill ‘Sapphire Blue’ is a perennial bulb with large, conical racemes of star-shaped violet/blue flowers in early summer.

Portuguese squill

Pride-of-Madeira, Echium candicans ‘Select Blue’ is an evergreen shrub with gray-green leaves and long stalks of periwinkle flowers that bloom in late spring to early summer. Hardy to about 25° F.


Delphinium ‘Blue Jay’ bears tall spikes of deep blue flowers in early summer.

Delphinium ‘Blue Jay’

Ground-Ivy Sage, Salvia glechomifolia is a creeping perennial native to the highlands of Central Mexico. Bears light blue flowers atop scalloped, yellow-green leaves.

Ground-ivy sage paired with lilac pansies

Columbine, Aquilegia, ‘Bluebird’ produces large, 3″ light blue and white upward facing blossoms in late spring. Grows 12 to 24 inches.

Columbine ‘Bluebird’

Happy planting!


5 thoughts on “True-Blue Flowers: A Dozen Of The Best And Brightest

  1. I love all your blog entries, Carole, but particularly this one. I love blue in the garden and the Klein quote is lovely to think about. Thank you.

    • Hi Nancy, I’m so glad you enjoyed the post! The Klein quote resonates with me as well – I think about it often when I’m in the garden; how it’s virtually impossible to distinguish the edges of blue. Thanks so much for writing! Best, Carole

  2. My mother was a gardener. Her biggest quest was to add blue flowers to her garden. This brings back so many memories for me. Thank you!

    • Hi Melissa, I love hearing stories like these. As you know, I think gardening is all about memories! The best gardens read like interesting books. I’d love to know what your mom’s favorite flowers are! Best,

  3. Pingback: How To Say What You Mean In The Language Of Flowers - Here By Design

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