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Primula fassettii

Jeweled Shootingstar

Family PrimulaceaeGenus Primula

Also published as Dodecatheon amethystinum. You are in the right place.

Magenta flowers with petals swept back from yellow-banded dark beaks, on red stalks
FlowerwackybadgerCC BY-SA 2.0

About the plant

What it is and where it grows — not part of any germination protocol.

Habit
Perennial, Forb/herbPLANTS Database
Native range
Native to the lower 48 statesPLANTS Database

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Source: PLANTS Database — USDA NRCS.

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around July 6, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 5, 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

about 9 months from start to sowing. Then 4 days to germinate.

34% germination in 4 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Dodecatheon p. 134Public domain
Show the original text
Dodecatheon (Primulaceae). D. amethystinum germ. 70D GA-3(1%)-40-70(33% in 5-12 d) and 700-40- 70D(none). This is puzzling because an earlier sample germ. 70-40-70(34% on 4th d) and 40-70(6%). Germination failed with all DS seed.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Dodecatheon p. 134. 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 High Rated by us, not by the source.

Start around June 28, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 27, 2026.

  1. Gibberellic acid soak

  2. Warm moist stratification

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

    1 germinated in this phase.

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 9 months from start to sowing. Then 12 days to germinate.

33% germination in 5–12 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Dodecatheon p. 134Public domain
Show the original text
Dodecatheon (Primulaceae). D. amethystinum germ. 70D GA-3(1%)-40-70(33% in 5-12 d) and 700-40- 70D(none). This is puzzling because an earlier sample germ. 70-40-70(34% on 4th d) and 40-70(6%). Germination failed with all DS seed.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Dodecatheon p. 134. 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 3

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. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

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

6% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Dodecatheon p. 134Public domain
Show the original text
Dodecatheon (Primulaceae). D. amethystinum germ. 70D GA-3(1%)-40-70(33% in 5-12 d) and 700-40- 70D(none). This is puzzling because an earlier sample germ. 70-40-70(34% on 4th d) and 40-70(6%). Germination failed with all DS seed.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Dodecatheon p. 134. 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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