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Corn Cockle
Agrostemma githago

Family: Caryophyllaceae (kar-ree-oh-fil-AY-see-ee) (Info)
Genus: Agrostemma (ag-roh-STEM-uh) (Info)
Species: githago (GITH-uh-go) (Info)




18-24 in. (45-60 cm)

24-36 in. (60-90 cm)


9-12 in. (22-30 cm)


Not Applicable

Sun Exposure:

Sun to Partial Shade


All parts of plant are poisonous if ingested

Bloom Color:

Magenta (Pink-Purple)

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Summer



Other details:

May be a noxious weed or invasive

This plant is attractive to bees, butterflies and/or birds

Average Water Needs; Water regularly; do not overwater

Soil pH requirements:

Unknown - Tell us

Patent Information:


Propagation Methods:

From seed; direct sow outdoors in fall

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds


This plant has been said to grow in the following regions:


Alameda, California

Grass Valley, California

Long Beach, California

Los Angeles, California

Sacramento, California

San Marino, California

Santa Clara, California

West Kill, New York

Salem, Oregon

Austin, Texas

Kalama, Washington

show all

Gardeners' Notes:


On Jul 1, 2011, matthewrude from San Marino, CA wrote:

This plant looked fantastic when I ordered it and when I initially planted. Are you supposed to dead head it?

After about a week to ten days it died right down to the ground.

What could I have done wrong? Any suggestions?


On Mar 2, 2005, melody from Benton, KY (Zone 7a) wrote:

This plant is native to Europe. In England, where 'corn' generally means wheat, Corn Cockle was a weed in grain fields. Before the advent of machine harvesting the separation of the poisonous seeds from the wheat was a tedious procedure.


On Nov 26, 2004, CatskillKarma from West Kill, NY wrote:

I grew a white cultivar of corn cockles several years ago in my mountaintop garden in the Catskills . I found it easy, although a bit late to flower in my short season garden. It did not self seed. The plants grew about a foot tall, and were pleasant in a meadow-like way.


On Nov 23, 2004, PvillePlanter from Pflugerville, TX (Zone 8b) wrote:

It has been identified as a noxious weed in Texas as well.


On Nov 12, 2004, cherishlife from Pocola, OK (Zone 7a) wrote:

This plant seems to be a noxious weed in a couple of states, according to the USDA website. Arkansas and South Carolina


On Aug 30, 2001, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

Hardy Annual. This makes a great cottage garden selection. Grows to a height of 3 feet and bears large, soft pink flowers in the summer. Fast growing plants with lance-shaped leaves will need support with stakes. Seeds are poisonous. Deadhead (remove faded flowers) to prolong flowering and encourage new flower buds. This annual reseeds easily.