Deno’s Garden

Primula frondosa

Genus Primula

This source reports 5 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around March 1, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 35 days to germinate.

46% germination in 14–35 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Primula p. 197Public domain
Show the original text
Primula. (Primulaceae). The discovery of a photorequirement in P. frondosa (F) is the most vigorous :of the farinosa variants. Fresh seed germ. 70(46% in 2-5 w) and less than 1% at 40. Seed DS 6 m at 70 germ. 70-40-70(42% in 5-9 d) and none at 40. Seed DS 6 m at 40 germ. 70(10%) and 40(25%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Primula p. 197. 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 January 2, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on January 1, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 15 months from start to sowing. Then 9 days to germinate.

42% germination in 5–9 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Primula p. 197Public domain
Show the original text
Primula. (Primulaceae). The discovery of a photorequirement in P. frondosa (F) is the most vigorous :of the farinosa variants. Fresh seed germ. 70(46% in 2-5 w) and less than 1% at 40. Seed DS 6 m at 70 germ. 70-40-70(42% in 5-9 d) and none at 40. Seed DS 6 m at 40 germ. 70(10%) and 40(25%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Primula p. 197. 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 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. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Temperature: 40°F 4°C

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

25% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Primula p. 197Public domain
Show the original text
Primula. (Primulaceae). The discovery of a photorequirement in P. frondosa (F) is the most vigorous :of the farinosa variants. Fresh seed germ. 70(46% in 2-5 w) and less than 1% at 40. Seed DS 6 m at 70 germ. 70-40-70(42% in 5-9 d) and none at 40. Seed DS 6 m at 40 germ. 70(10%) and 40(25%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Primula p. 197. 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 4

DerivedN. C. Deno, 1993

Difficulty 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. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C

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

10% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Primula p. 197Public domain
Show the original text
Primula. (Primulaceae). The discovery of a photorequirement in P. frondosa (F) is the most vigorous :of the farinosa variants. Fresh seed germ. 70(46% in 2-5 w) and less than 1% at 40. Seed DS 6 m at 70 germ. 70-40-70(42% in 5-9 d) and none at 40. Seed DS 6 m at 40 germ. 70(10%) and 40(25%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Primula p. 197. 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 5

DerivedN. C. Deno, 1993

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing.

0% germination.

Nothing germinated at 40.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Primula p. 197Public domain
Show the original text
Primula. (Primulaceae). The discovery of a photorequirement in P. frondosa (F) is the most vigorous :of the farinosa variants. Fresh seed germ. 70(46% in 2-5 w) and less than 1% at 40. Seed DS 6 m at 70 germ. 70-40-70(42% in 5-9 d) and none at 40. Seed DS 6 m at 40 germ. 70(10%) and 40(25%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Primula p. 197. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.