Deno’s Garden

Pyrus calleryana

Genus Pyrus

Two sources report 10 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Low Rated by us, not by the source.

Start around January 19, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on January 18, 2025.

  1. Dry storage

    Duration: 730 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Temperature: 40°F 4°C

about 2 years from start to sowing. Then 77 days to germinate.

88% germination in 28–77 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Pyrus p. 57Public domain
Show the original text
Pyrus (Rosaceae). P. calleryana DS 1 y germ. 40(88% in 4-10 w) and 70D-40(75% in 8th w)- 70D(25% on 3rd d). Seeds DS 2 y germ. 40(88% in 4-11 w) and 70D(35% in 2-8 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Pyrus p. 57. 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 Low Rated by us, not by the source.

Start around January 26, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on January 25, 2026.

  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 70 days to germinate.

88% germination in 28–70 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Pyrus p. 57Public domain
Show the original text
Pyrus (Rosaceae). P. calleryana DS 1 y germ. 40(88% in 4-10 w) and 70D-40(75% in 8th w)- 70D(25% on 3rd d). Seeds DS 2 y germ. 40(88% in 4-11 w) and 70D(35% in 2-8 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Pyrus p. 57. 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 February 9, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on February 8, 2025.

  1. Dry storage

    Duration: 730 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 2 years from start to sowing. Then 56 days to germinate.

35% germination in 14–56 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Pyrus p. 57Public domain
Show the original text
Pyrus (Rosaceae). P. calleryana DS 1 y germ. 40(88% in 4-10 w) and 70D-40(75% in 8th w)- 70D(25% on 3rd d). Seeds DS 2 y germ. 40(88% in 4-11 w) and 70D(35% in 2-8 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Pyrus p. 57. 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 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, 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

  4. Warm moist stratification

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

    25 germinated in this phase.

Steps after step 3 run on after germination.

about 1.5 years from start to sowing. Then 56 days to germinate.

75% germination in 56 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Pyrus p. 57Public domain
Show the original text
Pyrus (Rosaceae). P. calleryana DS 1 y germ. 40(88% in 4-10 w) and 70D-40(75% in 8th w)- 70D(25% on 3rd d). Seeds DS 2 y germ. 40(88% in 4-11 w) and 70D(35% in 2-8 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Pyrus p. 57. 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 Low Rated by us, not by the source.

Start around January 4, 2027 for a May 3 last frost.

  1. Clean the flesh off the seed

  2. Leach in running water

    Duration: 7 days

    Washed and cleaned daily for 7 days.

  3. Cold moist stratification

    Temperature: 40°F 4°C

7 days from start to 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, Pyrus p. 69Public domain
Show the original text
Pyrus (Rosaceae). P. "Buerre Bosc" germ. 70D(40% in 2-4 d)-40(10%)-70-40-70D(30% on 3rd d) and 40(100% in 4th w). Placing the seeds initially at 40 is best, and It is interesting that an initial 3 m at 70 causes germination to extend over a number of cycles. P. calleriana seeds;coliected in October and WC 7 d germ. 40(100% in 7-12 w) and 70(3%)-40(74% in 8-12 w) (2nd Ed.). This declines to 95% after 6 m DS and 73% after 18 m DS. A sample coliected in mid-December a year later germ. 70D(95% in 3-7 d) and 40(95% in 5-7 w). The interpretation is that the blocking mechanism is destroyed by allowing the fruit to experience the cold of Nov. and Dec. P. "Kieffer" germ. 40(50% in 2-8 w)-70(50% in 3-9 d) and 70D(10%). &
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pyrus 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 Low Rated by us, not by the source.

Start around August 18, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 17, 2025.

  1. Clean the flesh off the seed

  2. Leach in running water

    Duration: 7 days

    Washed and cleaned daily for 7 days.

  3. Dry storage

    Duration: 540 daysTemperature: 70°F 21°C

  4. Cold moist stratification

    Temperature: 40°F 4°C

about 1.5 years from start to sowing. Then 49 days to germinate.

95% germination in 35–49 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Pyrus p. 69Public domain
Show the original text
Pyrus (Rosaceae). P. "Buerre Bosc" germ. 70D(40% in 2-4 d)-40(10%)-70-40-70D(30% on 3rd d) and 40(100% in 4th w). Placing the seeds initially at 40 is best, and It is interesting that an initial 3 m at 70 causes germination to extend over a number of cycles. P. calleriana seeds;coliected in October and WC 7 d germ. 40(100% in 7-12 w) and 70(3%)-40(74% in 8-12 w) (2nd Ed.). This declines to 95% after 6 m DS and 73% after 18 m DS. A sample coliected in mid-December a year later germ. 70D(95% in 3-7 d) and 40(95% in 5-7 w). The interpretation is that the blocking mechanism is destroyed by allowing the fruit to experience the cold of Nov. and Dec. P. "Kieffer" germ. 40(50% in 2-8 w)-70(50% in 3-9 d) and 70D(10%). &
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pyrus 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 Low Rated by us, not by the source.

Start around September 29, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 28, 2025.

  1. Clean the flesh off the seed

  2. Leach in running water

    Duration: 7 days

    Washed and cleaned daily for 7 days.

  3. Dry storage

    Duration: 540 daysTemperature: 70°F 21°C

  4. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 1.5 years from start to sowing. Then 7 days to germinate.

95% germination in 3–7 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Pyrus p. 69Public domain
Show the original text
Pyrus (Rosaceae). P. "Buerre Bosc" germ. 70D(40% in 2-4 d)-40(10%)-70-40-70D(30% on 3rd d) and 40(100% in 4th w). Placing the seeds initially at 40 is best, and It is interesting that an initial 3 m at 70 causes germination to extend over a number of cycles. P. calleriana seeds;coliected in October and WC 7 d germ. 40(100% in 7-12 w) and 70(3%)-40(74% in 8-12 w) (2nd Ed.). This declines to 95% after 6 m DS and 73% after 18 m DS. A sample coliected in mid-December a year later germ. 70D(95% in 3-7 d) and 40(95% in 5-7 w). The interpretation is that the blocking mechanism is destroyed by allowing the fruit to experience the cold of Nov. and Dec. P. "Kieffer" germ. 40(50% in 2-8 w)-70(50% in 3-9 d) and 70D(10%). &
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pyrus 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 March 8, 2027 for a May 3 last frost.

  1. Clean the flesh off the seed

  2. Leach in running water

    Duration: 7 days

    Washed and cleaned daily for 7 days.

  3. Sow and cover

    Temperature: 70°F 21°C Light: dark

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

10% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Pyrus p. 69Public domain
Show the original text
Pyrus (Rosaceae). P. "Buerre Bosc" germ. 70D(40% in 2-4 d)-40(10%)-70-40-70D(30% on 3rd d) and 40(100% in 4th w). Placing the seeds initially at 40 is best, and It is interesting that an initial 3 m at 70 causes germination to extend over a number of cycles. P. calleriana seeds;coliected in October and WC 7 d germ. 40(100% in 7-12 w) and 70(3%)-40(74% in 8-12 w) (2nd Ed.). This declines to 95% after 6 m DS and 73% after 18 m DS. A sample coliected in mid-December a year later germ. 70D(95% in 3-7 d) and 40(95% in 5-7 w). The interpretation is that the blocking mechanism is destroyed by allowing the fruit to experience the cold of Nov. and Dec. P. "Kieffer" germ. 40(50% in 2-8 w)-70(50% in 3-9 d) and 70D(10%). &
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pyrus 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 9

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around November 3, 2026 for a May 3 last frost.

  1. Clean the flesh off the seed

  2. Leach in running water

    Duration: 7 days

    Washed and cleaned daily for 7 days.

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    50 germinated in this phase.

Steps after step 3 run on after germination.

about 3 months from start to sowing. Then 56 days to germinate.

50% germination in 14–56 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Pyrus p. 69Public domain
Show the original text
Pyrus (Rosaceae). P. "Buerre Bosc" germ. 70D(40% in 2-4 d)-40(10%)-70-40-70D(30% on 3rd d) and 40(100% in 4th w). Placing the seeds initially at 40 is best, and It is interesting that an initial 3 m at 70 causes germination to extend over a number of cycles. P. calleriana seeds;coliected in October and WC 7 d germ. 40(100% in 7-12 w) and 70(3%)-40(74% in 8-12 w) (2nd Ed.). This declines to 95% after 6 m DS and 73% after 18 m DS. A sample coliected in mid-December a year later germ. 70D(95% in 3-7 d) and 40(95% in 5-7 w). The interpretation is that the blocking mechanism is destroyed by allowing the fruit to experience the cold of Nov. and Dec. P. "Kieffer" germ. 40(50% in 2-8 w)-70(50% in 3-9 d) and 70D(10%). &
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pyrus 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 10

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around July 9, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 8, 2026.

  1. Clean the flesh off the seed

  2. Leach in running water

    Duration: 7 days

    Washed and cleaned daily for 7 days.

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    3 germinated in this phase.

  4. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

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

74% germination in 56–84 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Pyrus p. 69Public domain
Show the original text
Pyrus (Rosaceae). P. "Buerre Bosc" germ. 70D(40% in 2-4 d)-40(10%)-70-40-70D(30% on 3rd d) and 40(100% in 4th w). Placing the seeds initially at 40 is best, and It is interesting that an initial 3 m at 70 causes germination to extend over a number of cycles. P. calleriana seeds;coliected in October and WC 7 d germ. 40(100% in 7-12 w) and 70(3%)-40(74% in 8-12 w) (2nd Ed.). This declines to 95% after 6 m DS and 73% after 18 m DS. A sample coliected in mid-December a year later germ. 70D(95% in 3-7 d) and 40(95% in 5-7 w). The interpretation is that the blocking mechanism is destroyed by allowing the fruit to experience the cold of Nov. and Dec. P. "Kieffer" germ. 40(50% in 2-8 w)-70(50% in 3-9 d) and 70D(10%). &
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pyrus 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.