Deno’s Garden

Purshia tridentata

Genus Purshia

This source reports 8 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around January 11, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing. Then 84 days to germinate.

100% germination in 49–84 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Purshia p. 69Public domain
Show the original text
Purshia (Rosaceae). P. tridentata germ. best at 40 as shown by 40(100% in 7-12 w), 70L(20%)- 40(80% in 8th w), 70 GA-3(50% in 10th w), 70D-40(25% in 8-12 w)-70D(6%)-40(6%)- 70D(6%)-40(6%)-70D(6%), and 60% in April in OT. Seeds DS 6 m, 1 y, and 2 y germ 40-70D(70% in 2-4 d), 40-70D(60% in 1-4 d), and 40(8/12 in 5-11 w). These results are not entirely consistent, but they do indicate that the seeds are largeiy viable after 2 y of DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Purshia p. 69. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around August 13, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 12, 2026.

  1. Warm moist stratification

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

    20 germinated in this phase.

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 6 months from start to sowing. Then 56 days to germinate.

80% germination in 56 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Purshia p. 69Public domain
Show the original text
Purshia (Rosaceae). P. tridentata germ. best at 40 as shown by 40(100% in 7-12 w), 70L(20%)- 40(80% in 8th w), 70 GA-3(50% in 10th w), 70D-40(25% in 8-12 w)-70D(6%)-40(6%)- 70D(6%)-40(6%)-70D(6%), and 60% in April in OT. Seeds DS 6 m, 1 y, and 2 y germ 40-70D(70% in 2-4 d), 40-70D(60% in 1-4 d), and 40(8/12 in 5-11 w). These results are not entirely consistent, but they do indicate that the seeds are largeiy viable after 2 y of DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Purshia p. 69. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around April 7, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on April 6, 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 Light: dark

about 12 months from start to sowing. Then 4 days to germinate.

70% germination in 2–4 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Purshia p. 69Public domain
Show the original text
Purshia (Rosaceae). P. tridentata germ. best at 40 as shown by 40(100% in 7-12 w), 70L(20%)- 40(80% in 8th w), 70 GA-3(50% in 10th w), 70D-40(25% in 8-12 w)-70D(6%)-40(6%)- 70D(6%)-40(6%)-70D(6%), and 60% in April in OT. Seeds DS 6 m, 1 y, and 2 y germ 40-70D(70% in 2-4 d), 40-70D(60% in 1-4 d), and 40(8/12 in 5-11 w). These results are not entirely consistent, but they do indicate that the seeds are largeiy viable after 2 y of DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Purshia p. 69. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around July 23, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 22, 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. Then 77 days to germinate.

67% germination in 35–77 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Purshia p. 69Public domain
Show the original text
Purshia (Rosaceae). P. tridentata germ. best at 40 as shown by 40(100% in 7-12 w), 70L(20%)- 40(80% in 8th w), 70 GA-3(50% in 10th w), 70D-40(25% in 8-12 w)-70D(6%)-40(6%)- 70D(6%)-40(6%)-70D(6%), and 60% in April in OT. Seeds DS 6 m, 1 y, and 2 y germ 40-70D(70% in 2-4 d), 40-70D(60% in 1-4 d), and 40(8/12 in 5-11 w). These results are not entirely consistent, but they do indicate that the seeds are largeiy viable after 2 y of DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Purshia p. 69. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around April 7, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on April 6, 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 Light: dark

about 12 months from start to sowing. Then 4 days to germinate.

60% germination in 1–4 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Purshia p. 69Public domain
Show the original text
Purshia (Rosaceae). P. tridentata germ. best at 40 as shown by 40(100% in 7-12 w), 70L(20%)- 40(80% in 8th w), 70 GA-3(50% in 10th w), 70D-40(25% in 8-12 w)-70D(6%)-40(6%)- 70D(6%)-40(6%)-70D(6%), and 60% in April in OT. Seeds DS 6 m, 1 y, and 2 y germ 40-70D(70% in 2-4 d), 40-70D(60% in 1-4 d), and 40(8/12 in 5-11 w). These results are not entirely consistent, but they do indicate that the seeds are largeiy viable after 2 y of DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Purshia p. 69. 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, 1996

Difficulty Moderate Rated by us, not by the source.

  1. Sow outdoors and leave it

    Up in April.

No stated waiting before sowing.

60% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Purshia p. 69Public domain
Show the original text
Purshia (Rosaceae). P. tridentata germ. best at 40 as shown by 40(100% in 7-12 w), 70L(20%)- 40(80% in 8th w), 70 GA-3(50% in 10th w), 70D-40(25% in 8-12 w)-70D(6%)-40(6%)- 70D(6%)-40(6%)-70D(6%), and 60% in April in OT. Seeds DS 6 m, 1 y, and 2 y germ 40-70D(70% in 2-4 d), 40-70D(60% in 1-4 d), and 40(8/12 in 5-11 w). These results are not entirely consistent, but they do indicate that the seeds are largeiy viable after 2 y of DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Purshia p. 69. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around January 25, 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 70 days to germinate.

50% germination in 70 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Purshia p. 69Public domain
Show the original text
Purshia (Rosaceae). P. tridentata germ. best at 40 as shown by 40(100% in 7-12 w), 70L(20%)- 40(80% in 8th w), 70 GA-3(50% in 10th w), 70D-40(25% in 8-12 w)-70D(6%)-40(6%)- 70D(6%)-40(6%)-70D(6%), and 60% in April in OT. Seeds DS 6 m, 1 y, and 2 y germ 40-70D(70% in 2-4 d), 40-70D(60% in 1-4 d), and 40(8/12 in 5-11 w). These results are not entirely consistent, but they do indicate that the seeds are largeiy viable after 2 y of DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Purshia p. 69. 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, 1996

Difficulty High Rated by us, not by the source.

Start around July 16, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 15, 2026.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

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

    6 germinated in this phase.

  4. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    6 germinated in this phase.

  5. Warm moist stratification

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

    6 germinated in this phase.

  6. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    6 germinated in this phase.

  7. Warm moist stratification

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

    6 germinated in this phase.

Steps after step 2 run on after germination.

about 6 months from start to sowing. Then 84 days to germinate.

25% germination in 56–84 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Purshia p. 69Public domain
Show the original text
Purshia (Rosaceae). P. tridentata germ. best at 40 as shown by 40(100% in 7-12 w), 70L(20%)- 40(80% in 8th w), 70 GA-3(50% in 10th w), 70D-40(25% in 8-12 w)-70D(6%)-40(6%)- 70D(6%)-40(6%)-70D(6%), and 60% in April in OT. Seeds DS 6 m, 1 y, and 2 y germ 40-70D(70% in 2-4 d), 40-70D(60% in 1-4 d), and 40(8/12 in 5-11 w). These results are not entirely consistent, but they do indicate that the seeds are largeiy viable after 2 y of DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Purshia p. 69. 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.