Deno’s Garden

Pourthiaea villosa

Genus Pourthiaea

Two sources report 7 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

Start around September 20, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 19, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

about 6 months from start to sowing. Then 18 days to germinate.

100% germination in 9–18 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Photinia p. 54Public domain
Show the original text
Photinia (Rosaceae). Data on P. villosa is now complete. Seeds germ. 40-70D(100% 9-18 d) and 70D-40(30% in 12th w)-70D(70% on 2nd d) confirming the _ earlier conclusion that the blocking mechanism requires 3 m at 40 after which it germinates at either 40 or 70. Seeds DS 1 y germ. 40(96% in 7-16 w) and 70D- 40(16% in 12th w)-70D(84% in 2-6 d). Seeds DS 2 y germ. 40(33% in 12th w)- 70D(43% in 2-21 d) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Photinia p. 54. 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, 1998

Difficulty Moderate Rated by us, not by the source.

Start around July 8, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 7, 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

    30 germinated in this phase.

  3. Warm moist stratification

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

about 9 months from start to sowing. Then 2 days to germinate.

70% germination in 2 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Photinia p. 54Public domain
Show the original text
Photinia (Rosaceae). Data on P. villosa is now complete. Seeds germ. 40-70D(100% 9-18 d) and 70D-40(30% in 12th w)-70D(70% on 2nd d) confirming the _ earlier conclusion that the blocking mechanism requires 3 m at 40 after which it germinates at either 40 or 70. Seeds DS 1 y germ. 40(96% in 7-16 w) and 70D- 40(16% in 12th w)-70D(84% in 2-6 d). Seeds DS 2 y germ. 40(33% in 12th w)- 70D(43% in 2-21 d) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Photinia p. 54. 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, 1998

Difficulty Moderate Rated by us, not by the source.

Start around July 4, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 3, 2025.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Warm moist stratification

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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    16 germinated in this phase.

  4. Warm moist stratification

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

about 1.5 years from start to sowing. Then 6 days to germinate.

84% germination in 2–6 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Photinia p. 54Public domain
Show the original text
Photinia (Rosaceae). Data on P. villosa is now complete. Seeds germ. 40-70D(100% 9-18 d) and 70D-40(30% in 12th w)-70D(70% on 2nd d) confirming the _ earlier conclusion that the blocking mechanism requires 3 m at 40 after which it germinates at either 40 or 70. Seeds DS 1 y germ. 40(96% in 7-16 w) and 70D- 40(16% in 12th w)-70D(84% in 2-6 d). Seeds DS 2 y germ. 40(33% in 12th w)- 70D(43% in 2-21 d) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Photinia p. 54. 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, 1998

Difficulty Low Rated by us, not by the source.

Start around December 15, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 14, 2025.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Temperature: 40°F 4°C

about 12 months from start to sowing. Then 112 days to germinate.

96% germination in 49–112 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Photinia p. 54Public domain
Show the original text
Photinia (Rosaceae). Data on P. villosa is now complete. Seeds germ. 40-70D(100% 9-18 d) and 70D-40(30% in 12th w)-70D(70% on 2nd d) confirming the _ earlier conclusion that the blocking mechanism requires 3 m at 40 after which it germinates at either 40 or 70. Seeds DS 1 y germ. 40(96% in 7-16 w) and 70D- 40(16% in 12th w)-70D(84% in 2-6 d). Seeds DS 2 y germ. 40(33% in 12th w)- 70D(43% in 2-21 d) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Photinia p. 54. 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, 1998

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, 2024.

  1. Dry storage

    Duration: 730 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    33 germinated in this phase.

  3. Warm moist stratification

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

about 2.5 years from start to sowing. Then 21 days to germinate.

43% germination in 2–21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Photinia p. 54Public domain
Show the original text
Photinia (Rosaceae). Data on P. villosa is now complete. Seeds germ. 40-70D(100% 9-18 d) and 70D-40(30% in 12th w)-70D(70% on 2nd d) confirming the _ earlier conclusion that the blocking mechanism requires 3 m at 40 after which it germinates at either 40 or 70. Seeds DS 1 y germ. 40(96% in 7-16 w) and 70D- 40(16% in 12th w)-70D(84% in 2-6 d). Seeds DS 2 y germ. 40(33% in 12th w)- 70D(43% in 2-21 d) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Photinia p. 54. 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 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.

90% germination in 70–84 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Photinia p. 65Public domain
Show the original text
Photinia (Rosaceae). P. villosa has been restudied and germ. 40-70D(100% in 2nd w) in contrast to an earlier sample that germ. 40(90% in 10-12 w). "me two patterns are not that different as both show that the blocking mechanism requires 2-3 m at 40 to be destroyed.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Photinia p. 65. 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 September 23, 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 Light: dark

about 6 months from start to sowing. Then 14 days to germinate.

100% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Photinia p. 65Public domain
Show the original text
Photinia (Rosaceae). P. villosa has been restudied and germ. 40-70D(100% in 2nd w) in contrast to an earlier sample that germ. 40(90% in 10-12 w). "me two patterns are not that different as both show that the blocking mechanism requires 2-3 m at 40 to be destroyed.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Photinia p. 65. 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.