When to plant Cornflower
Bachelor's button — a tough, cottage-garden annual with intense blue (or pink and white) flowers. Very hardy, it's direct-sown in cool spring or fall soil and self-sows year after year. The edible flowers and long stems make it a fine cut flower.
Companions: Vegetables generally — a top nectar source for bees and beneficials
How to grow Cornflower
Cornflower is best direct-sown straight into the garden, as it dislikes being transplanted. Give it full sun and space plants about 8 inches apart. It takes roughly 65 days from planting to its first harvest, so count that against your frost dates to be sure it can finish. It also supports a fall sowing for a second harvest. Classic companions include vegetables generally — a top nectar source for bees and beneficials.
Grower's tip: Also called bachelor's button — a hardy, easy annual; sow direct in cool soil and it self-sows freely.
When to plant Cornflower by USDA zone
Timing shifts with your climate — the same cornflower goes in weeks earlier in a mild zone than a cold one. Find your zone below for its planting window, or open that zone's full calendar.
| Zone | When to plant |
|---|---|
| Zone 1a | Direct sow outdoors May 18–Jun 8 Direct sow outdoors Jun 20–Jul 4 |
| Zone 1b | Direct sow outdoors May 13–Jun 3 Direct sow outdoors Jun 25–Jul 9 |
| Zone 2a | Direct sow outdoors May 8–May 29 Direct sow outdoors Jun 30–Jul 14 |
| Zone 2b | Direct sow outdoors May 2–May 23 Direct sow outdoors Jul 7–Jul 21 |
| Zone 3a | Direct sow outdoors Apr 27–May 18 Direct sow outdoors Jul 14–Jul 28 |
| Zone 3b | Direct sow outdoors Apr 22–May 13 Direct sow outdoors Jul 18–Aug 1 |
| Zone 4a | Direct sow outdoors Apr 17–May 8 Direct sow outdoors Jul 24–Aug 7 |
| Zone 4b | Direct sow outdoors Apr 12–May 3 Direct sow outdoors Jul 28–Aug 11 |
| Zone 5a | Direct sow outdoors Apr 7–Apr 28 Direct sow outdoors Aug 6–Aug 20 |
| Zone 5b | Direct sow outdoors Apr 2–Apr 23 Direct sow outdoors Aug 10–Aug 24 |
| Zone 6a | Direct sow outdoors Mar 24–Apr 14 Direct sow outdoors Aug 22–Sep 5 |
| Zone 6b | Direct sow outdoors Mar 18–Apr 8 Direct sow outdoors Aug 30–Sep 13 |
| Zone 7a | Direct sow outdoors Mar 10–Mar 31 Direct sow outdoors Sep 7–Sep 21 |
| Zone 7b | Direct sow outdoors Mar 4–Mar 25 Direct sow outdoors Sep 15–Sep 29 |
| Zone 8a | Direct sow outdoors Feb 22–Mar 15 Direct sow outdoors Sep 23–Oct 7 |
| Zone 8b | Direct sow outdoors Feb 15–Mar 8 Direct sow outdoors Sep 30–Oct 14 |
| Zone 9a | Direct sow outdoors Jan 31–Feb 21 Direct sow outdoors Oct 10–Oct 24 |
| Zone 9b | Direct sow outdoors Jan 18–Feb 8 Direct sow outdoors Oct 20–Nov 3 |
| Zone 10a | Direct sow outdoors Jan 3–Jan 24 Direct sow outdoors Nov 2–Nov 16 |
| Zone 10b | Direct sow outdoors Dec 18–Jan 8 Direct sow outdoors Nov 5–Nov 19 |
| Zone 11a | Direct sow outdoors Dec 4–Dec 25 Direct sow outdoors Nov 5–Nov 19 |
| Zone 11b | Direct sow outdoors Dec 4–Dec 25 Direct sow outdoors Nov 5–Nov 19 |
| Zone 12a | Direct sow outdoors Dec 4–Dec 25 Direct sow outdoors Nov 5–Nov 19 |
| Zone 12b | Direct sow outdoors Dec 4–Dec 25 Direct sow outdoors Nov 5–Nov 19 |
| Zone 13a | Direct sow outdoors Dec 4–Dec 25 Direct sow outdoors Nov 5–Nov 19 |
| Zone 13b | Direct sow outdoors Dec 4–Dec 25 Direct sow outdoors Nov 5–Nov 19 |