How to Grow Corn Cockle
Agrostemma githago
Corn cockle is a hardy annual wildflower for full sun and well-drained, poor to average soil. Sow seed directly where it is to flower — autumn sowing gives the strongest spring display; spring sowing flowers in summer. Thin seedlings to 15 cm apart and water during dry spells. No feeding needed. Deadhead to prolong flowering or leave a few heads to self-seed and naturalise. IMPORTANT — the seeds are toxic; keep away from children and pets.
When to Start
Direct sow outdoors as soon as soil reaches 10°C — typically early to mid spring. Hardy enough to tolerate light frosts.
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Growth Stages
Approximate days from start
Care Essentials
- No feeding required — corn cockle thrives in poor to moderately fertile soil.
- Sow directly in autumn for the best spring display, or in early spring for summer flowers. Thin seedlings to 15 cm apart. Corn cockle self-seeds freely — allow a few plants to set seed to naturalise a wildflower patch. CAUTION — all parts of the plant, especially the seeds, are toxic if ingested.
Growing Conditions
- Germination temperature
- 5–18°C
Pet Safety
- Direct sow
- —
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Spacing & Planting
| Plant spacing | 15 cm |
| Row spacing | 20 cm |
| Sow depth | 0.5 cm |
| Mature height | 90 cm |
| Mature spread | 30 cm |
Growing Conditions
| Germination temperature | 5–18°C |
Frequently Asked Questions
- How far apart should I plant Corn Cockle?
- Plant Corn Cockle 15cm apart with 20cm between rows.
- Is Corn Cockle frost hardy?
- Corn Cockle is classified as Hardy.
