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Cornflower Seeds - Black
SEASON
Annual
USDA ZONES
3 - 10
HEIGHT
32 inches
BLOOM SEASON
Late spring to early fall
BLOOM COLOR
Black
ENVIRONMENT
Full sun to partial shade
SOIL TYPE
Well-drained, pH 6.6 - 7.8
DEER RESISTANT
Yes
HOUSE PLANT
No
About...
(Centaurea Cyanus Tall Double Ball Black) - Easy-to-grow from seeds, this tall annual makes a great addition to the summer border. The color is a deep, rich claret which is as close to black as possible. Centaurea Cyanus Black Ball certainly adds drama and is resistant to drought.MORE CORNFLOWER OPTIONS
Planting Directions
TEMPERATURE
65F
AVERAGE GERM TIME
14 - 21 days
LIGHT REQUIRED
No
DEPTH
1/4 inch
SOWING RATE
10 - 12 seeds per plant or 6 seeds per foot
MOISTURE
Keep seeds moist until germination
PLANT SPACING
6 - 12 inches
Cornflower (Centaurea Cyanus Tall Double Ball Black) - Easy-to-grow from seeds, this tall annual makes a great addition to the summer border. The color is a deep, rich claret which is as close to black as possible. Centaurea Cyanus Black Ball certainly adds drama! Cornflowers are especially nice in traditional cottage gardens, and they make an excellent cut flower. Also known as Bachelor's Button Black Ball, these flowers are native to much of the United States.
Bachelor's Button plants prefer full sun in mild climates and partial shade in the hottest regions. They tolerate a wide variety of soils as long as it drains well. Centaurea Cyanus performs the best in mild climates with moderate water, but the plants can tolerate drought. Cornflowers are very attractive to both bees and butterflies, but fortunately deer leave the plants alone.
Directly sow seeds outdoors in early spring as soon as soil can be worked. Prepare seedbed by loosening soil and weeding. Sow the flower seed in rows ensuring you sow at least 6 seeds per foot. Thin young plants to 6 - 12 inches apart. In mild winter climates, seed can be sown in the fall for very early blooms the following spring. Cornflowers will drop their mature seeds and often self-sow providing climate conditions work out.
Common Questions
Where should I plant cornflower?
Enhance your ornamental vegetable garden by incorporating the versatile cornflower. Its nectar content attracts pollinators, benefiting the yield of tomatoes, squash, and other dependent plants. In a wildflower garden, plant cornflower to attract bees and butterflies. Alternatively, in a cutting garden, pair blue cornflower with annuals such as orange cosmos or yellow marigolds. Grow cornflower alongside robust perennials like rudbeckia or coneflower to provide natural support for its stems.
Do I need to deadhead my cornflowers?
You can increase our bloom season if you deadhead your flowers. Deadheading however is not necessary.
How can I encourage more blooms?
Cornflowers thrive in bright and sunny environments, so it's crucial to plant them in a sunny location. If your cornflowers aren't blooming because of inadequate light, your best option is to plan ahead for the following year and sow them in a sunnier area.
How Long Does Cornflower Bloom?
Cornflowers usually flower for approximately 10 weeks, from May to mid-July. Extending the bloom time can be achieved by seeding the flower every two weeks on a staggered schedule.
Can I grow my cornflower in containers?
Yes, when cultivating cornflowers in pots or containers, it's important to maintain slightly dry soil to replicate pasture environments. Opt for porous clay or terracotta pots for best results. Select well-draining soil with perlite, or opt for a soilless mix composed of organic materials (similar to cactus potting soil). Regularly remove faded blooms from your potted cornflowers to keep them looking neat. Expect a brief flowering period when grown in this manner. Shorter varieties work best in containers.
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