Deno’s Garden

Astrantia involucrata

Genus Astrantia

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty High Rated by us, not by the source.

Start around January 31, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on January 30, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: dark

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

    27 germinated in this phase.

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: dark

    7 germinated in this phase.

  4. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

  5. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: either

    8 germinated in this phase.

Steps after step 4 run on after germination.

about 12 months from start to sowing. Then 70 days to germinate.

50% germination in 56–70 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Astrantia p. 16Public domain
Show the original text
Astrantia (Apiaceae). Larger samples of A. involucrata germ. 70D-40(27% in 6-8 w)-70D(7%)-40(50% in 8-10 w)-70(8%) and 40-70-40(30% in 8-12 w)-70(25% in 5-9 d)-40(45% in 12th w). Light and GA-3 had no effect. The 3 m at 70 was necessary before the germination at 40.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Astrantia p. 16. 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 High Rated by us, not by the source.

Start around October 19, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 18, 2025.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: either

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

    30 germinated in this phase.

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: either

    25 germinated in this phase.

  5. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

about 15 months from start to sowing. Then 84 days to germinate.

45% germination in 84 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Astrantia p. 16Public domain
Show the original text
Astrantia (Apiaceae). Larger samples of A. involucrata germ. 70D-40(27% in 6-8 w)-70D(7%)-40(50% in 8-10 w)-70(8%) and 40-70-40(30% in 8-12 w)-70(25% in 5-9 d)-40(45% in 12th w). Light and GA-3 had no effect. The 3 m at 70 was necessary before the germination at 40.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Astrantia p. 16. 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.