Centaurea cyanus 'Black Ball'

Dark-crimson, double blooms that don't fade. I wouldn't be without it. More
300 seeds 020009 £1.95 In stock
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Centaurea cyanus 'Black Ball' has dark crimson double flowers, whose colour doesn't fade. It dries brilliantly too. A long standing favourite.

No cottage garden is complete without it's cornflowers – Loved by Pollinators and brilliant cut flowers. We use lots of them for wedding and party flowers to make table runners and napkin rings as they last brilliantly out of water.

Genus Centaurea
Group/Species cyanus
Variety Black Ball
Type Hardy Annual
Common Name Cornflower
Border Position Middle
Soil Type Chalky, Neutral, Sandy
Scent Unscented
Site Full Sun
Moisture Moist but Well-drained, Well-drained
Height 90cm (36in), or if autumn-sown 1-1.2m (39-47in)
Spacing 30-40cm (12-16in), 45cm (18in) if autumn sown
Sowing, Seeds, Planting Sow in mid spring and/or late summer for larger, earlier flowers the following year.
Care Tips Deadhead to encourage further flowering. Needs staking.
Flowering May - July, 10-12 weeks from spring sowing
Vase Life 5-7 days. Dries well. They last brilliantly out of water - and so can be made into many types of arrangements and craft ideas.
Harvesting Flower production: 2-3 months. This is a cut-and-come-again variety.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  • Sow Under Cover/Plant Indoors
  • Direct Sow/Plant Outdoors
  • Flowers/Harvest
Sowing flowers in late summer

 Sarah shows how to sow flowers in late summer for more beautiful plants next spring.

Direct sowing seeds

Learn how to get great results when direct sowing hardy annual seeds.


Seeds Delivery - When in stock, please allow 2-3 working days for delivery.

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Centaurea cyanus 'Black Ball' reviews

* * * * - Average based on 2 reviews

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Reviewed 31st July 2019 by Jill

Fab flowerers. Gorgeous planted with lime nicotiana. Two blue seeds germinated from this pack.

Lovely colour

* * * * -

Reviewed 10th August 2015 by Lisa

I grew two sowings of this, one in autumn and one in spring. The autumn sowings were far taller, but too tall even for the back of my border and despite staking still flopped. The spring sown ones I pinched out and were far better behaved and looked better For longer.. The foliage is silvery too which makes a great foil for the flowers and looks good in a mixed border. Even the ones in semi shade did well. Would sow again!