What spring-blooming perennials have blue flowers?

Question:

What spring-blooming perennials have blue flowers?

Answer:

Several perennials have blue blooms that appear between early April and early June.  They include: 

Spring Blooming Perennials with Blue Flowers (listed by approximate bloom time)

Common Name	Genus	Height (inches)	Light	Comments
Virginia bluebells	Mertensia virginiana	6-12	Part shade - shade	Woodland native to US; flower buds emerge pink – then open blue; ephemeral
Woodland Phlox	Phlox divaricata	8-15	Part shade - shade	Woodland native to US; Light blue flowers; fragrant
Crested Iris	Iris cristata	3-9	Sun to part shade	Native to US; Blue, lavender, white, yellow flowers
Lungwort	Pulmonaria hybrids	9-18	Part shade	Pink in bud, opens blue; many cultivars have silvery leaves
Heartleaf Brunnera	Brunnera macrophylla	12-18	Part sun-Shade	Tiny blue, forget-me-not like flowers
Columbine	Aquilegia species and hybrids	8-36	Sun-Part sun	Some species native to US: Many species and hybrids with many flower colors; reseeds
Bluestar	Amsonia species	12-36	Sun-Part sun	Some species native to US; Pale blue star-shaped flowers; often golden fall foliage color
Mountain Bluet	Centaurea montana	12-24	Sun	Dark blue, white, pink, or purple flowers; spreading habit
False Indigo	Baptisia australis	24-48	Sun	Native to US; selections and hybrids with blue, white, pink, and yellow flowers
Bearded Iris	Iris hybrids	8-36	Sun	flowers in every color; keep rhizomes at soil surface
Siberian Iris	Iris sibirica	24-36	Sun	Blue, yellow, white, and pink flowers; several other Iris species with blue flowers
Jacob’s Ladder	Polemonium caeruleum	18-24	Part shade	Native to US; Light blue flowers; variegated leaf cultivars available
Perennial Flax	Linum perenne	10-18	Sun-part shade	Sky blue flowers on small, airy plants
Blue-eyed grass	Sisyrinchium	6-15	Sun – part shade	Native to US; Bright blue flowers with grassy leaves

Learn more in this article: Blue Blooms for the Midwestern Garden.