Cornflower Blue Ball (Centaurea cyanus) – blue and pink blooms in a grassy field

Cornflower Blue Ball

£2.30
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Cornflower Blue Ball (Centaurea cyanus) – blue and pink blooms in a grassy field
RHS Plants for PollinatorsBeginner friendly

Cornflower Blue Ball

Centaurea cyanus 'Blue Ball' — the definitive cornflower; cyanus = blue in Greek

4 reviews

The definitive cornflower — masses of fully double, ruffled, electric azure-blue flowers on tall silvery stems. The cottage garden classic with edible petals.

£2.30

Free UK delivery on seed orders over £40

Dispatched from our Norfolk farm by Royal Mail, usually within one working day.

Your growing year

Sow, plant out and flowering months for this variety

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sow
Plant out
In flower
SowPlant outIn flower

At a glance

Height
75–90cm
Spread
30cm
Spacing
30cm
Position
Full sun
Colour
Blue
Seeds per packet
200
Soil
Lean, well-drained — no manure or compost; poor soil produces strongest stems
Grow guide How to grow Cornflower Blue Ball Read the full guide →

About this variety

The cornflower that named the colour. Dense, fully double, ruffled heads in an electric azure that looks lit from inside, on silver-green stems. If you grow only one cornflower it should be this one.

It is a genuine cut-and-come-again plant. The more you take, the more it makes, and a short row will keep a jug filled from early summer to the frosts. Stop cutting for a fortnight and it sets seed and shuts down, which is the commonest way people lose a cornflower crop in July.

Two honest notes. The doubling that makes the flower substantial also crowds the centre, so it is less use to bees than the single wild form; if pollinators are the priority, grow some wild cornflower alongside it. And at this height the stems lean after heavy rain unless there is something to hold them, so run a net or some twiggy sticks through the row early rather than after it has gone over. Self-sown seedlings drift back towards smaller, simpler flowers within a couple of generations.

Plant alongside

Chosen by us, not by an algorithm

RHS Plants for Pollinators

This plant has been assessed by the Royal Horticultural Society and recommended as especially beneficial to bees, butterflies and other pollinators. Growing plants like this directly supports UK pollinator populations — something close to our hearts at Salle Moor Hall Farm, where we see the difference a cottage garden full of the right plants can make.

Learn more at RHS.org.uk →
  • 5 stars: 4 (100%)
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L
Lou
Excellent germination rate

I’ve bought annual seeds from Melanie for 2-3 years with great success (as in germination rate) Always receive very swiftly from order and well packaged. Recommend.

A
Abby
Very happy!

Quick delivery, beautifully packaged and already starting to germinate! Thank you

H
Helen Court
Thank you!

Lovely variety of seeds and really great instructions and tips both on the packet and on the website. Sent quickly and great quality seeds- only planted them 6 days ago and so many sprouting already. Thank you again!

T
Tamsin Wilson

A classic easy to grow beauty. Thank you for such an easy and delightful buying process. The photos and information on your site is eye candy