Agrostemma (Corn Cockle) in Zone 3a & 3b

Agrostemma githago

When to plant agrostemma (corn cockle) in zone 3b

Zones 3a and 3b share the same average frost dates in our data, so this page covers both.

Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Agrostemma (Corn Cockle) tolerates either.

Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.

Agrostemma, better known as corn cockle, has a history as an unwanted weed in European grain fields before it found a second life as a deliberately grown cut flower. Its delicate, magenta-pink blooms on tall, wiry stems have the airy, cottage-garden look that's hard to get from a sturdier, more structured flower.

How agrostemma (corn cockle) fits zone 3's season

Zone 3b's frost-free window runs about 98 days, from May 30 to September 5. Agrostemma (Corn Cockle) needs about 75 days from sowing to first harvest.

Good companions

No standout companions recorded yet for Agrostemma (Corn Cockle).

Where to buy agrostemma seeds

• Botanical Interests
• True Leaf Market
• Burpee
• High Mowing Organic Seeds

See why we recommend these suppliers →

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See it growing

Search YouTube for "growing agrostemma (corn cockle)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)

← Back to the full zone 3b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →

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Growing Agrostemma (Corn Cockle) in USDA zone 3b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.

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