Cornflower 'Black Gem'

Centaurea cyanus

How to grow Cornflower 'Black Gem'

  • Partial Sun

  • Medium

Try to plant in a location that enjoys partial sun and remember to water moderately. Keep in mind when planting that Black Gem is thought of as half hardy, so it will require protection in frosts and low temperatures.

Growing Black Gem from seed

Sow at a depth of approx. 0.23 inches (0.6 cm) and aim for a distance of at least 0.98 inches (2.5 cm) between Cornflower plants.

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

Transplanting Black Gem

As Black Gem is half hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.

Harvesting Black Gem