Deno’s Garden

Primula japonica

Genus Primula

This source reports 10 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate 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.

100% germination in 2–4 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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 Moderate 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

    1 germinated in this phase.

  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.

97% 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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 Moderate 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

    20 germinated in this phase.

  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.

80% 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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 Low 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.

70% 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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

Difficulty Moderate 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

    30 germinated in this phase.

  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.

70% 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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 6

DerivedN. C. Deno, 1993

Difficulty Moderate 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.

50% 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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 7

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

  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.

50% 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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 8

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around December 21, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 20, 2025.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

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

50% 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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 9

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 14 days to germinate.

45% germination in 14 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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 10

DerivedN. C. Deno, 1993

Difficulty Moderate 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.

30% 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. japonica (Can) is largely a 40-70 germinator. Fresh seed germ; 70-40- 70(100% in 2-4 d), 70 GA-3(45% in 2nd w), and 40-70(50%).. Seed DS 6 m at 70 or 40 germ. 70(1%)-40-70(50%) and 40(30%).-70(70%). The increasing effect of DS at 70 was shown by DS for 0, 1, 3, and 6 m. The respective germinations were 40- 70(50%), .40(1%)-70(97%), 40(20%)-70(80%), and 40(30%)-70(70%). The lOnger the DS at 70 the faster the germination at 40. However, seed DS at 70 for 2 y was dead.
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.