Seed Swaps


Centaurea cyanus

Cornflower is a plant which belongs to the Centaurea genus.

This plant is attractive to bees, butterflies, birds and other pollinators. It is particularly beneficial in early spring before many flowers are blooming because it has extrafloral nectaries, which means the plant’s leaves release nectar even when the flowers are not blooming. Research in Germany has found that bachelor button nectar has a very high sugar content of 75 percent1.
Attracts hoverflies, a pollinator that sometimes resembles a bee.

The flowers are edible and are a great addition to salads.

Blooms appear in these approximate colours:   Blue-violet and   Dark lavender.

Cornflower grows as an annual and is a flower. Being an annual plant, it tends to grow best over the course of a single year.

Cornflower normally grows with a erect habit to a mature height of 90.0 cm (that's 2.93 feet imperial). This plant tends to bloom in early summer.

Try planting Cornflower if you'd like to attract butterflies and birds to your garden.

Blue Boy, Cyanus Double Mixed Colors, Polka Dot, Blue Ball and Tall mixed are some of the most popular varieties of Cornflower for home gardeners to grow.

France is believed to be where Cornflower originates from.

As Cornflower is a low maintanence plant, it is great for beginner gardeners and those that like gardens that don't need much overseeing.

This plant info is provided by the myfolia gardener's wiki. All details about Cornflower have been kindly provided by our members.

How to grow Cornflower

  • Partial Sun

  • Dappled Sun

  • Medium

Plant in a location that enjoys partial sun / dappled sun and remember to water moderately. Zone 6 to 11 are typically the USDA Hardiness Zones that are appropriate for this plant (although this can vary based on your microclimate). Keep in mind when planting that Cornflower is thought of as half hardy, so it will need cloching or fleece protection when the temperature dips.

See our list of companion Plants for Cornflower to see which plants you should plant in close proximity to encourage growth.

Growing Cornflower from seed

Look to ensure a distance 0.98 inches (2.5 cm) between seeds when sowing - bury at a depth of at least 0.23 inches (0.6 cm) deep.

By our calculations*, you should look at sowing Cornflower about 7 days after your last frost date .

Transplanting Cornflower

Ensure that temperatures are mild and all chance of frost has passed before planting out, as Cornflower is a half hardy plant.

Seed Saving Cornflower

Seed viability is two years.

How long does Cornflower take to grow?

These estimates for how long Cornflower takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.

Start logging and journaling your observations to participate!

Days to Germination How long does it take Cornflower to germinate?
11 days

Average 11 days | Min 2 days | Max 28 days (47)

Days to Transplant How long until I can plant out Cornflower?
+ 41 days

Average 41 days | Min 16 days | Max 76 days (14)

Days to Maturity How long until Cornflower is ready for harvest / bloom?
+ 58 days

Average 58 days | Min 56 days | Max 61 days (3)

Total Growing Days How long does it take to grow Cornflower?
= 110 days

When should I plant Cornflower?

Our when to plant Cornflower estimates are relative to your last frost date.

Enter your frost dates and we'll calculate your sowing and planting dates for you!

When to sow The number of days to sow Cornflower before or after your last frost date.
7 days after Last Frost Date

Cornflower Folklore & Trivia

Native of Europe it has become naturalized in the US.2

Other names for Cornflower

Bachelor's button, Basket flower, Bluebottle, Boutonniere flower, Hurtsickle, Bachelor button, cyani flower, hurtcickle, Pennington wildflower mix

Centaurea cyanus L.

Misspellings: Bachelors Button

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