Cornflower Black (Centaurea cyanus), also known as Black Bachelor’s Button, is a rare heirloom variety with deep, dark purple-black blooms that add dramatic contrast to the garden. These easy-to-grow annuals are pollinator magnets, drawing in bees and butterflies all summer long. Perfect for wildflower patches, borders, and cottage gardens, they also make long-lasting cut flowers, both fresh and dried. Hardy and low-maintenance, this Non-GMO variety thrives in full sun and adapts well to poor soils, making it a favorite for naturalized plantings.
How to Plant
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When: Direct sow outdoors in early spring or fall; can also be started indoors 6–8 weeks before last frost.
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Soil & Sun: Prefers well-drained soil; full sun.
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Depth: ¼ inch.
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Spacing: Sow 6–8 inches apart.
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Water: Moderate; drought tolerant once established.
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Days to maturity: 65–75 days.
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Bloom Period: Early summer to frost with successive sowings.
Garden Uses
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Pollinator Gardens: Attracts bees, butterflies, and beneficial insects.
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Cut Flowers: Striking black blooms for fresh bouquets or dried arrangements.
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Borders & Beds: Adds rich color and contrast.
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Cottage Gardens: Blends beautifully with other heirloom flowers.