Deno’s GardenMy Garden

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
perennialPlants of the World Online
Habit
Perennial, Forb/herbPLANTS Database
Flower
MagentaRead from the photograph on this page
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.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; PLANTS Database — USDA NRCS; Read from the photograph on this page — Deno's Garden.

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 October 4, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 3, 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 6 months from start to step 3. Germination happens during step 3, in 4 days.

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 September 26, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 25, 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 6 months from start to step 4. Germination happens during step 4, in 12 days.

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 December 15, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 3 months from start to step 2. Germination happens during step 2; 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.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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