- Species and varieties: Centaurea cyanus, commonly known as cornflower or bachelor's button, is an annual flowering plant in the family Asteraceae. It has several varieties, including 'Blue Boy', 'Polka Dot Mix', and 'Classic Romantic'.
- Hybrid or heirloom: Centaurea cyanus seeds are typically heirloom varieties, meaning they are open-pollinated and have been passed down through generations without genetic modification.
- Pruning and training: Deadheading spent flowers will encourage continuous blooming. Cornflowers do not require extensive pruning or training, making them low-maintenance plants.
- Fertilization needs: Centaurea cyanus does not have high fertilization needs. A balanced, all-purpose fertilizer applied at planting time is usually sufficient. Over-fertilization can lead to excessive foliage growth at the expense of flowers.
- Hardiness zones: Centaurea cyanus is suitable for USDA hardiness zones 2-11, making it adaptable to a wide range of climates.
- Climate requirements: Cornflowers thrive in full sun and prefer well-drained soil. They are drought-tolerant once established and can grow in poor soil conditions. Ideal growing temperatures range from 60°F to 70°F (15°C to 21°C).