Cornflower 'Blue Diadem'

Centaurea cyanus

How to grow Cornflower 'Blue Diadem'

  • Partial Sun

  • Medium

Try to plant in a location that enjoys partial sun and remember to water moderately. Keep in mind when planting that Blue Diadem is thought of as half hardy, so it will need cloching or fleece protection when the temperature dips.

Growing Blue Diadem 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 Blue Diadem about 7 days after your last frost date.

Transplanting Blue Diadem

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

Harvesting Blue Diadem