Centaurea Blue

Mountain Bluet

A hardy, clump-forming perennial with clear blue, thistle-like flowers borne above gray-green foliage in late spring to early summer, often with repeat bloom if deadheaded. ‘Blue’ is valued for its long-lived performance, easy care, and pollinator appeal, adding bright color to borders and naturalized plantings.

Size: 18–24 in wide × 18–24 in tall

Zones: 3a–8b
Light: Full sun to partial shade
Soil: Well-drained soils; adaptable to average garden soils
Water: Moderate; drought tolerant once established

Suitable Conditions:



Climate: Performs well in cool to moderate climates



Exposure: Full sun promotes best flowering; tolerates light shade



Soil pH: Neutral to slightly alkaline



Drainage: Essential; avoid consistently wet soils



Spacing: Allow room for clump expansion; divide as needed to control spread



Notes:



Shape: Upright clumps with loose, spreading tendencies over time



Attracts bees and butterflies



Excellent for mixed borders, cottage gardens, and naturalized areas



Can spread by rhizomes; divide periodically to maintain vigor



Deer and rabbit resistant

Plant type

Perennial

Height

18-24''

Width

18-24"

Hardiness zones

3–8

Sunlight

Full sun to part shade

Growth rate

Moderate

Bloom time

Early Summer, Late Spring

Flower color

Blue

Fall color

SeaGreen

Attracts

Butterflies

Soil

Alkaline, Loamy well-drained

Shape

Clumping

Deer resistant

Yes

Drought tolerant

No