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Cornflower, Bachelor's Button
Scientific Name: Centaurea cyanus L.
Family: Asteraceae

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Recommended Temperature Zone: sunset: All zones USDA: Heat Tolerance: Blooms before the summer heat in Phoenix Sun Exposure: Full sun Origin: Europe (Caucasus) Growth Habits: Hardy annual, up to 2 feet tall (60 cm), 12 inches spread (30 cm) Watering Needs: Moderate water, well drained alkaline soil, Propagation: Seeds

Propagation:
Sow in late summer or fall in Phoenix or other mild winter areas. The seeds germinate better if they have been kept in your refrigerator for 5 days before sowing. They do better if sowed in place, in any case they should be covered with a thin layer of soil (0.1 inch - 3 mm), since light tends to inhibit the germination. The seeds take about one and a half weeks to germinate. Thin out to 8 to 12 inches apart (20 to 30 cm). Cornflowers will generally self-sow and come back from year to year.