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Cut flowers2 varieties
Delphinium
Delphinium elatumTall herbaceous perennial producing dense spires of flowers suited to borders and cutting.
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Days to maturity
105–125 daysDays to germ.
10–20 daysSpacing
12–18 inHeight
36–48 inSun
Sun,Partial ShadeHow we grow it
Germination
- Days to germ.
- 10–20 d
Culture
- Days to maturity
- 105–125 d
- Spacing
- 12–18 in
- Height
- 36–48 in
- Sun
- Sun,Partial Shade
- Frost
- tender
- Hardiness zones
- 3–7
Harvest
- Handling
- Harvest when 1/4-1/3 of the flowers on a stem are open. Place cut stems in water immediately.
Timing · Zone 5a
JanFebMarAprMayJunJulAugSepOctNovDec
Sow indoorsApr 9
Outdoor / directMay 21 – Jun 18
Bloom (from indoor)Jul 23 – Aug 13
Bloom (from outdoor)Sep 3 – Oct 22
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 Delphinium sowingSeed sources, counts, ratings, and the observations kept against each one.Delphinium trials