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Bachelor button, commonly known as cornflower and botanically classified as Centaurea cyanus, is an annual flowering plant valued for its upright growth and vibrant blooms. It develops slender stems with narrow foliage and produces single, fringed flowers in shades of blue during the growing season. This plant adapts well to temperate climates and performs best in full sun with well-drained soil. Bachelor button is commonly used in garden beds, borders, and naturalized planting, where it establishes easily from seeds and grows steadily under suitable conditions.
Features
- Annual plant with upright, slender growth
- Produces fringed blue flowers
- Suitable for garden beds, borders, and naturalized areas
- Adapted to sunny and temperate conditions
- Establishes readily from seeds
Specifications
- Scientific name: Centaurea cyanus
- Common name (US): Cornflower
- Seed type / variety: Blue flowering variety
- Growth habit: Upright annual
- USDA zones: 2-11 (grown as annual)
- Planting season: Spring or fall
- Growing season: Spring to summer
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Sowing Season:
- Spring: March to May
- Fall: September to November
- Germination time and conditions: 7-14 days at 15-20°C
- Sunlight requirements: Full sun
- Soil requirements: Well-drained, moderately fertile soil
- Watering needs: Low to moderate once established
- Mature plant size: 30-90 cm height, 20-30 cm spread
- Plant spacing: 20-30 cm between plants
