Seed Swaps

Cornflower 'Black Ball'

Centaurea cyanus

  • 2 plantings
  • 3 available for swap
  • 2 wanted
  • 10 stashed

Black Ball is a popular variety of Cornflower, which belongs to the Centaurea genus (Centaurea cyanus 'Black Ball'). A type of Flower, it mainly grows as an Annual plant - which means it typically only grows best for a single growing season. Black Ball normally grows to a mature height of 90.0 cm (that's 2.93 feet imperial).

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

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

How to grow Black Ball

  • Partial Sun

  • Medium

Black Ball likes a position of partial sun and remember to water moderately. Keep in mind when planting that Black Ball is thought of as half hardy, so remember to protect this plant from frosts and low temperatures. Use USDA Hardiness Zone 6 - 11 as your guideline for the appropriate climate for this plant.

Growing Black Ball from seed

Try to aim for a seed spacing of at least 0.98 inches (2.5 cm) and sow at a depth of around 0.23 inches (0.6 cm).

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

Transplanting Black Ball

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

Harvesting Black Ball