Deno’s Garden

Primula veris

Genus Primula

This source reports 9 treatments. All are shown.

Protocol 1

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. Cold moist stratification

    Temperature: 40°F 4°C

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

100% 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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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 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: 40°F 4°C

  2. Cold moist stratification

    Temperature: 40°F 4°C

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

100% 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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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 Low Rated by us, not by the source.

Start around March 8, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 28 days to germinate.

95% germination in 7–28 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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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 February 1, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing. Then 63 days to germinate.

80% germination in 21–63 days.

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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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 Low 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 Light: dark

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

76% 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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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 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. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    30 germinated in this phase.

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    20 germinated in this phase.

Steps after step 2 run on after germination.

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

46% 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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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 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

    25 germinated in this phase.

Steps after step 1 run on after germination.

about 3 months from start to sowing. Germination time not stated; 21 days assumed.

45% 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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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 June 19, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 18, 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

    20 germinated in this phase.

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    10 germinated in this phase.

Steps after step 2 run on after germination.

about 9 months from start to sowing. Germination time not stated; 21 days assumed.

40% 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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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 High 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: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    22 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

    7 germinated in this phase.

Steps after step 3 run on after germination.

about 12 months from start to sowing. Germination time not stated; 21 days assumed.

27% 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. veris (V) is one of the few Primulas that sets seed naturally and self sows here. Although DS is not essential for germination, it improves germination. The DS occurs naturally to some extent as the seeds are retained in the capsule long after the capsule has dried. For example a sample collected in November germ. 70D(95% in 1-4 w), 70D GA-3(76% in 2nd w), and 40(80% in 3-9 w). A sample collected in August germ. in a more extended manner, 70(30%)-40(46%)-70(20%) and 40(45%)-70(25%). When this latter sample was DS 6 m at 70, it germ. 70(40%)-40(20%)-70(10%) and 40(100%), and when DS 6 m at 40, it germ; 70(22%)-40(27%)-70(7%) and 40(100%).
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.