Perennial Bachelor's Button - Drought Hardy Prairie Plants
Perennial Bachelor’s Button (Centaurea montana), also known as Mountain Bluet, is a hardy, clump-forming perennial prized for its fringed blue blooms and silvery-green foliage. Each flower appears like a small, wild thistle softened by vivid color, opening in late spring and continuing through early summer. This species thrives in poor to average soil and requires little maintenance once established, making it a dependable performer for informal or naturalized gardens. Its nectar-rich flowers draw bees, butterflies, and other pollinators, while its ability to handle cool climates and rocky soils adds practical versatility to its charm.
Applications in the Garden
Ideal for cottage gardens and mixed perennial borders needing early-season color
Naturalizes well along paths, slopes, or meadow-style plantings
Excellent companion for early bloomers like poppies, irises, and columbines
Useful in pollinator gardens due to its high nectar value
Adds texture and soft color beneath shrubs or in front of taller perennials
Works well in rock gardens or less fertile soils where other plants may struggle
Planting Tips - Perennial Bachelor's Button
Choose a sunny site, though partial shade is tolerated in hot regions
Plant in well-draining soil; it adapts easily to sandy or gravelly textures
Avoid heavy, wet soils that can lead to crown rot
Space plants 18–24 inches apart to allow for spreading clumps
Water regularly during establishment, then only during prolonged dry spells
Deadhead spent blooms to encourage a second flush of flowers later in the season
Cut back foliage after flowering if it begins to look tired; new leaves will regrow quickly
Plant Biography and Growing Environment
| Botanical Name: | Centaurea Montana |
| Variety Name: | Mountain Blue |
| Height: | 24″ |
| Hardiness Zone: | 3-8 |
| Sun or Shade: | Full sun to partial shade |
| Plant Classification: | Perennial |
| Planting Season: | Spring or Fall |
| Bloom Season: | Spring – Summer |
| Bloom Cycle: | Twice per season |
| Bloom Duration: | 10 weeks |
| Planting Depth: | 2″-3″ |
| Soil Requirements: | Average, dry to medium well-draining soils. Avoid rich soils |
| Water Requirements: | Average |
Troubleshooting - Perennial Bachelor's Button
Flopping stems – can occur in shade or overly rich soil; relocate to full sun and avoid fertilizing
Powdery mildew – common in crowded or humid sites; improve air flow and remove affected foliage
Invasive spreading – divide clumps every few years to control spread and rejuvenate growth
Poor flowering – typically from insufficient light or old, dense clumps; divide and replant younger sections
Yellowing leaves – may result from overwatering; allow soil to dry slightly between waterings
FAQ - Perennial Bachelor's Button
Q: Is Perennial Bachelor’s Button invasive?
A: It can spread by underground rhizomes but is easily managed by dividing clumps every few years.
Q: Is Perennial Bachelor’s Button deer resistant?
A: Yes. Deer usually avoid it due to its slightly hairy leaves and bitter taste.
Q: Is Perennial Bachelor’s Button toxic to pets or people?
A: No. Centaurea montana is considered non-toxic to humans and pets.
Q: Will it rebloom if cut back?
A: Often, yes. Cutting back spent stems in midsummer can encourage a lighter second flush of blooms.