Flower growing guide
Cornflowers
Centaurea cyanus
Sun
Full sun
Season
Cool
Maturity
60 to 75 days
Water
Low
Soil pH
6.0 to 7.5
Spacing
8 to 12 in
Planting cornflowers
Sow directly in early spring, or in fall where winters are mild. Seed germinates best in cool soil and plants resent transplanting.
Planting details
- Sow where plants will grow
- Spacing: 8 to 12 inches
- Seed depth: about 1/4 inch
Growing requirements
Cornflowers want full sun and lean to average soil with good drainage. They are tougher than they look and need little water once established.
Harvesting and care
Deadhead or cut small bouquets to extend bloom. Let a few plants finish their cycle if you want them to self-sow for next spring.
Common mistakes
- Rich soil, which grows floppy, leafy plants
- Sowing into warm summer soil, which germinates poorly
- Skipping thinning, since crowded seedlings make weak stems
Companion plants
Cornflowers mix well with poppies and sweet alyssum in meadow-style sowings, and fit the sunny edge of a vegetable plot as a pollinator draw.