Corncockle
Agrostemma githago
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Annual
Height
30 inches
Width
12 inches
Light
Full Sun
Zones
4, 5, 6, 7, 8, 9
Water
Low to moderate
Humidity
Average
Lifespan
Annual
Native To
Europe and Asia
Toxicity
All parts are toxic, especially the seeds
The Story
Plant Bio
Agrostemma githago, commonly known as corncockle, is a hardy annual flowering plant known for its delicate pink flowers and tall stems. Historically a common weed in European grain fields, it is now often included in wildflower seed mixes. All parts of the plant, especially the seeds, are poisonous.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Sow seeds directly into well-drained soil in early spring.
- Tuck seeds 1/4 inch deep and space them 6 inches apart.
- Mist seeds lightly to keep soil moist during germination, which takes 7-14 days.
- Thin seedlings to 12 inches apart once established.
- Water regularly but avoid overwatering to prevent root rot.
- Deadhead spent flowers to encourage more blooms.
Pro Tip
Plant in full sun with lean soil for best flowering performance.
Keep It Thriving
Care Guide
Do
- Water moderately during dry spells 🌱
- Deadhead regularly to prolong blooming
- Provide full sun for optimal growth
Don't
- Avoid overwatering, which can cause root rot ❌
- Don’t fertilize heavily, as it prefers poor soil
- Keep away from shaded areas
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Plant | ||||||||||||
| Stake |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Corncockle questions
What zones can Corncockle grow in?
Corncockle is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Corncockle deer resistant?
Not reliably. Deer may browse Corncockle, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Corncockle bloom?
Corncockle typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Corncockle need full sun?
Corncockle does best in full sun (6+ hours).
Is Corncockle drought tolerant?
Yes — once established (usually after the first full season), Corncockle handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
Keep exploring
Explore the genus
Collections featuring this plant
Grow Corncockle with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
