Cornflower Growing Guide

Centaurea cyanus

Crop Rotation Group

Miscellaneous ●

Soil

Any good garden soil.

Position

Full sun.

Frost tolerant

Young cornflower seedlings can tolerate freezing temperatures, so seeds can be planted in early spring, or in autumn where winters are mild.

Feeding

Fast growth is encouraged by mixing a balanced organic fertiliser into the soil before planting.

Spacing

Single Plants: 20cm (7") each way (minimum)
Rows: 20cm (7") with 20cm (7") row gap (minimum)

Sow and Plant

Sow cornflowers from early to mid spring for early summer bloom. Also sow in autumn in climates with mild winters. Plant seeds in soil or in containers about 5 cm apart and 1 cm deep. Thin to 20 cm apart in all directions.
Our Garden Planner can produce a personalized calendar of when to sow, plant and harvest for your area.

Notes

Flowers are edible. Rice-size cornflower seeds are much loved by goldfinches and other small seed-eating birds.

Harvesting

Cornflowers make good cut flowers. Pull up the plants in mid to late summer, when they no longer look attractive.

Planting and Harvesting Calendar

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Pests which Affect Cornflower

Aphids (General)

Slug

Snail