8 Dark Blue Flowers for the Garden

Balloon Flower

This spectacular perennial is named from its balloon-shaped flower buds that open to reveal star-shaped petals. Remove spent blooms to keep this plant blooming from early to late summer.

Blue Phlox

You'll be happy when spring blossoms cover your flowerbed floor. This natural groundcover, often known as woodland phlox, grows 8 18 inches tall and has open clusters of powder-blue or lavender-blue.

Blue Catmint

Months of flowering, drought-tolerant, fragrant, and your cat will adore you what's not to like? Flower colors include lavender-blue to blue-purple. Plant it along a walkway or in a rock garden and shear occasionally to promote blooming.


Clematis' enormous flowers are charming whether they climb a mailbox, cover a trellis, or move along a fence. The showiest clematis hybrids like full light on their foliage and mulch or low-growing plants for shelter on their roots.

Cornflower (Bachelor's Button)

This annual blooms well in cottage gardens and meadows and farms. Get multiple blossoms for intense color. The color is so striking that prom boutonnieres include it. 'Tall Blue' and 'Blue Boy' are 3 feet tall.


Carolina larkspur (D. carolinianum) and tall larkspur (D. exaltatum) are trustworthy native species for growing this lovely cottage garden flower in the South. Delphiniums in rich soil at the rear of your sunny border need frequent watering.

Eastern Bluestar

Powder blue blooms cover this 2-to-3-foot perennial in spring, and its leaves turn beautiful yellow in autumn. To attract hummingbirds, bees, and butterflies, plant this native in a rain garden or flower border drifts.

Edging Lobelia

These tubular, lipped flowers are brilliant blue and hard to look away from. Plant it as a winter-to-spring annual to spill over pots or at the front of your garden to show off its matlike bunches. Lobelia likes chilly, damp weather.