Delphinium

(seed; cutflower)

Stage 1

Rooting hormones
No

Vermiculite cover
Yes

Soil temp (min)
60

Soil temp (max)
65

Irrigation frequency
Dry

Surfactant
No

Time (min)
7

Time (max)
10

Stage 2

Soil temp (min)
65

Soil temp (max)
70

Moisture
Dry

Fertilizer
50-75 1x/wk

Soil EC
<0.75

Time (min)
7

Time (max)
7

Stage 3

Soil temp (min)
62

Soil temp (max)
65

Allow to wilt
No

Wash leaves
No

Fertilizer
100-150 1x/wk

Soil EC
<1.0

Time (min)
28

Time (max)
28

Stage 4

Soil temp (max)
62

Allow to wilt
No

Wash leaves
No

Fertilizer
100-150 1x/wk

Soil EC
<0.75

Time (min)
8

Time (max)
9

General

  • Best germination if cool, dry, and covered
  • For Giant Pacific Court series, alternating temperatures of 80°F day/70°F night (26°C/21oc) may improve germination
  • Control moisture for best germination! The Cardinale types require 2-3 weeks longer plug crop time, and Casa Blanca requires 1-2 weeks longer plug crop time
  • May benefit from vernalization treatment for earlier flowering
  • 8-9 weeks total crop time

adapted from data published by Dr. Roger Styer