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Level: Easy

Centaurea cyanus (true cornflower)

Centaurea cyanus (true cornflower)

EUR3.25
EUR3.25
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Always a free A3 seeding calendar with your seeds!

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We ship in-stock products within 1 - 2 business days.

+ Mailbox post: €3.95 in the Netherlands
+ Parcel post: €5.75 in the Netherlands, €6.50 in Belgium

Free shipping on orders from 50 euros in the Netherlands | from 75 euros in Belgium

Sustainability

We try to produce as sustainably as possible to keep our footprint small. Therefore, our letterbox boxes are made of grass paper and tomato leaf pulp is the basic component of the seed bags. The printing is either made of paper that is 30-70% recycled paper or paper that comes from agricultural waste. In addition, you have the option to plant a tree when you place an order through Regreener.

Gifting

Is (part of) your order a gift for someone? Mention it in the comments and we will wrap it nicely for you.

Cornflowers are so characteristic of our landscape, yet you encounter them less and less in the wild. They are important food sources for bees and bumblebees, as well as butterflies. Grows best on somewhat poor soil, even on sand goes well. 

Name Centaurea cyanus (true cornflower)
Species Annual
Contents 1 gram / approx. 110 seeds / approx. 1 - 2 m2
Color Blue
Height 90 cm
Location Full sun
Suitable for pot or balcony No
Edible Yes
Dryflower Yes
Native Yes

Pre-sowing February - April / August - October
Direct seeding March - May
Flowering time June - September

Indoor pre-seeding
Pre-sow from August to October for early flowering the following year, or from mid-February to late April. Cover the seeds with a thin layer of soil; they need light to germinate. Put them in a room of about 15  degrees in a bright spot but away from direct sunlight. Keep the soil moist. Repot once the seedlings have 2 sets of true leaves and put in a cool place. Transplant early, around mid-April. Place fall seedlings in a cold greenhouse to overwinter and plant the following spring.

Direct sowing
Sow directly into the soil starting in March. Cover the seeds with a thin layer of soil. Do not do this during heavy rain or on hot days to prevent the seed from washing away or drying out. Keep the soil moist. After germination, thin out to single seedlings 15 cm apart.

Which is what?

The terms may be new to you, here's what they all mean:

Annual- plants that bloom one summer and then die
Biennial- plants that you sow one year, and bloom the next year (and then die)
Perennial- plants that bloom several summers
Perennial- plants that survive frost and last for years

How many hours of sunshine?

Annuals plants almost without exception grow only in full sun. That means that you preferably need more than 8 hours of summer sun in the place where you want to grow them, for example from 10 - 18 hours. 6 - 7 hours will also go a long way, but the plants will grow just a little slower.

What soil?

Unless otherwise specified, annuals want nutrient-rich soil with extra compost in the spring. Read more about it in the Seed Guide.

Seediguide

Never seeded before? We'll get you started with a Sowing Guide explaining the basics and supplies.

Storing seeds

On the package of your seeds you will find the shelf life. You can use them until the date you see on it. An opened package is best stored in an airtight box in a cool and dark place, such as a closet in the hallway. Not sure if the germination is still good? Then it's best to buy a new pack. We deliberately choose small amounts of seeds in the packs so you don't have to waste seeds. Do you have any questions about this? Call 033 - 202 43 38 or email to [email protected], and we will help you further.

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learn to grow your own

No experience with self-sowing and growing plants yet? No problem! We'll explain the basics so you can get started. Read the Sowing Guide here.

  • Free shipping from 50 euros*

    We ship your order for free with ordes over 50 euros (Netherlands). For Belgium, the minimum order is 75 euros.

  • Free seeding calendar

    You always receive our A3 seeding calendar for free when you order seeds.