Deno’s Garden

Delphinium geyeri

Genus Delphinium

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

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

Start around June 19, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 18, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 9 months from start to sowing. Germination time not stated; 21 days assumed.

5% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Delphinium p. 130Public domain
Show the original text
Delphinium (Ranunculaceae). . This genus is composed of a group of medium heigth monocarpic species typified by D. geyeri germ. 57% at the end of March from outdoor sowing in late fall. Germination dropped to 5% when sown at 70 or 40 as shown by 70-40(5%)-70 and 40- 70-40(5%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Delphinium p. 130. 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, 1993

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

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

Steps after step 2 run on after germination.

about 6 months from start to sowing. Germination time not stated; 21 days assumed.

5% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Delphinium p. 130Public domain
Show the original text
Delphinium (Ranunculaceae). . This genus is composed of a group of medium heigth monocarpic species typified by D. geyeri germ. 57% at the end of March from outdoor sowing in late fall. Germination dropped to 5% when sown at 70 or 40 as shown by 70-40(5%)-70 and 40- 70-40(5%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Delphinium p. 130. 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.