300 seeds 020008 £1.95 In stock
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5 seedlings, for spring planting 510733-5 £5.95 Delivery late March
When in stock, please allow up to 2 weeks for delivery.
10 seedlings, for spring planting 510733-10 £9.95 Delivery late March
When in stock, please allow up to 2 weeks for delivery.

Or buy this as part of our Amethyst and Sapphire Cut Flower Mix and Hardy Annual Cutting Patch Collection.

More Details

Centaurea cyanus 'Blue Boy' is a large-flowered cornflower in classic bright blue. This wonderful coloured bloom will continue for 2-3 months in the summer.

This is one of the prettiest wild flowers, and it used to populate entire fields with its incredible hue. It's juice even used to be extracted and mixed with alum to make a watercolour.

No cottage garden is complete without its cornflowers – Loved by Pollinators and brilliant as 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 Blue Boy
Type Hardy Annual
Common Name Cornflower
Border Position Middle
Soil Type Chalky, Neutral, Sandy
Scent Unscented
Site Full Sun, Shelter
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 June - August, 10-12 weeks from spring sowing
Vase Life 5-7 days. Dries well.
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.


Plant Delivery - When in stock, please allow up to 2 weeks for delivery.

Seeds Delivery - Items will be despatched in 5-7 working days.

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Centaurea cyanus 'Blue Boy' reviews

* * * * * Average based on 3 reviews
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Reviewed 11th June 2016 by Dido

I had a go at growing these from seed and planting them in the autumn to overwinter, and it worked brilliantly - I was picking the first cornflowers in mid-May, just as the tulips went over, and they are not only beautiful but also prolific. A huge success.

Everlasting Sarah Raven-Corn flowers

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Reviewed 31st October 2015 by Mich Denney

It's the first year I have grown these beautiful little blue cherubs which just keep sprouting and sprouting and are still even sprouting new flowers nearly into November- they have been a central focal point in the walled garden at East Pennard and on open days It has been a great conversation topic and hopefully Sarah may have some more custom from it- I have used quite a lot tossed into salad bags which I grow and they look sublime- great bee attractor and very productive anual and with the amount of seed saved I will never need to buy a packet again

Gorgeous colour

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Reviewed 7th November 2014 by mia clark

These were the most brilliant blue, really showy, and grew easily from seed. I note that they are even bigger from autumn sowing so I will have a go. Excellent in a vase, they fade gently. I really love these!