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Delphinium bicolor

Genus Delphinium

Deep violet-blue flowers with spreading sepals, a pale centre and a straight backward spur, against a blue sky
FlowerUnknown authorUnknown authorPublic domain

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

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

  1. Dry storage

    Duration: 180 daysTemperature: 40°F 4°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    3 germinated in this phase.

Steps after step 2 run on after germination.

about 9 months from start to sowing. Then 84 days to germinate.

75% germination in 56–84 days.

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. bicolor germ. best with seed DS 6 m at 40 in 40(75% in 8-12 w)-70(3% in one d). Seed DS 6 m at 70 germ. nearly as well as shown by 40(31% in 8-12 w)- 70(37% in one d). •Both of these DS seeds gave zero germination when sown at 70, a fatal treatment. With fresh seed germination dropped to 27% when sown at either 40 or 70 and extended over four cycles occurring mainly in the 4th cycle.
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 Moderate Rated by us, not by the source.

Start around March 21, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 20, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    31 germinated in this phase.

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 12 months from start to sowing. Germination time not stated; 21 days assumed.

37% 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. bicolor germ. best with seed DS 6 m at 40 in 40(75% in 8-12 w)-70(3% in one d). Seed DS 6 m at 70 germ. nearly as well as shown by 40(31% in 8-12 w)- 70(37% in one d). •Both of these DS seeds gave zero germination when sown at 70, a fatal treatment. With fresh seed germination dropped to 27% when sown at either 40 or 70 and extended over four cycles occurring mainly in the 4th cycle.
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.

How each step is done, in Deno’s words, and what Verified and Derived mean.

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