All guides
Cut flowers1 variety
Cornflower
Centaurea cyanusCool-season annual with fringed flowers on slender stems, valued for cutting and pollinator plantings.
No photograph yet
Days to maturity
65–80 daysDays to germ.
7–14 daysSpacing
6–12 inHeight
24–36 inSun
SunHow we grow it
Germination
- Days to germ.
- 7–14 d
Culture
- Days to maturity
- 65–80 d
- Spacing
- 6–12 in
- Height
- 24–36 in
- Sun
- Sun
- Frost
- tender
Harvest
Recent field notes
Today's harvest.
Timing · Zone 5a
JanFebMarAprMayJunJulAugSepOctNovDec
Sow indoorsApr 9
Outdoor / directMay 21 – Jun 18
Windows are anchored to an average last frost of May 21 (1 year in 10 as early as Apr 29, as late as Jun 2) and an average first frost of Sep 18 (1 year in 10 as early as Sep 6, as late as Oct 8). In a late or early year, slide them with it.
Compare in the calendarTrials
Every Cornflower sowingSeed sources, counts, ratings, and the observations kept against each one.Cornflower trials