Deno’s Garden

Delphinium grandiflorum

Genus Delphinium

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Low Rated by us, not by the source.

Start around March 16, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 15, 2026.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 12 months from start to sowing. Then 21 days to germinate.

75% germination in 7–21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Delphinium p. 28Public domain
Show the original text
Delphinium (Ranunculaceae). D. grandiflorum (Larkspur) germ. in 5-7 d at 70D using fresh seeds. Seeds DS 1 y germ. 70D(75% in 1-3 w), and seeds DS 2 y germ. 70D(7% in 4th w). A sample of hybrid seed DS 3 y was dead. >
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Delphinium p. 28. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1998

Difficulty Very high Rated by us, not by the source.

Start around March 9, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 8, 2026.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 12 months from start to sowing. Then 28 days to germinate.

7% germination in 28 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Delphinium p. 28Public domain
Show the original text
Delphinium (Ranunculaceae). D. grandiflorum (Larkspur) germ. in 5-7 d at 70D using fresh seeds. Seeds DS 1 y germ. 70D(75% in 1-3 w), and seeds DS 2 y germ. 70D(7% in 4th w). A sample of hybrid seed DS 3 y was dead. >
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Delphinium p. 28. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.