Deno’s Garden

Philadelphus coronarius

Genus Philadelphus

This source reports 6 treatments. All are shown.

Protocol 1

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.

68% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Philadelphus p. 191Public domain
Show the original text
Philadelphus (Saxifragaceae). P. coronarius germ. better after DS. Seed DS 6 m 70 germ. 70(58% in 5-25 d) and 40-70(57% in 3-20 d). Fresh seed germ. 70(2%)-40-70(41%) and 40-70(14%)-40-70. Seed DS 6 m 40 germ. 70(16%) and 40- 70(68%) showing an intermediate behavior.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Philadelphus p. 191. 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 13, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 12, 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. Then 25 days to germinate.

58% germination in 5–25 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Philadelphus p. 191Public domain
Show the original text
Philadelphus (Saxifragaceae). P. coronarius germ. better after DS. Seed DS 6 m 70 germ. 70(58% in 5-25 d) and 40-70(57% in 3-20 d). Fresh seed germ. 70(2%)-40-70(41%) and 40-70(14%)-40-70. Seed DS 6 m 40 germ. 70(16%) and 40- 70(68%) showing an intermediate behavior.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Philadelphus p. 191. 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 March 22, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 21, 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. Then 20 days to germinate.

57% germination in 3–20 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Philadelphus p. 191Public domain
Show the original text
Philadelphus (Saxifragaceae). P. coronarius germ. better after DS. Seed DS 6 m 70 germ. 70(58% in 5-25 d) and 40-70(57% in 3-20 d). Fresh seed germ. 70(2%)-40-70(41%) and 40-70(14%)-40-70. Seed DS 6 m 40 germ. 70(16%) and 40- 70(68%) showing an intermediate behavior.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Philadelphus p. 191. 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 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. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    2 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

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

41% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Philadelphus p. 191Public domain
Show the original text
Philadelphus (Saxifragaceae). P. coronarius germ. better after DS. Seed DS 6 m 70 germ. 70(58% in 5-25 d) and 40-70(57% in 3-20 d). Fresh seed germ. 70(2%)-40-70(41%) and 40-70(14%)-40-70. Seed DS 6 m 40 germ. 70(16%) and 40- 70(68%) showing an intermediate behavior.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Philadelphus p. 191. 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 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. 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.

16% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Philadelphus p. 191Public domain
Show the original text
Philadelphus (Saxifragaceae). P. coronarius germ. better after DS. Seed DS 6 m 70 germ. 70(58% in 5-25 d) and 40-70(57% in 3-20 d). Fresh seed germ. 70(2%)-40-70(41%) and 40-70(14%)-40-70. Seed DS 6 m 40 germ. 70(16%) and 40- 70(68%) showing an intermediate behavior.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Philadelphus p. 191. 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. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

Steps after step 2 run on after germination.

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

14% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Philadelphus p. 191Public domain
Show the original text
Philadelphus (Saxifragaceae). P. coronarius germ. better after DS. Seed DS 6 m 70 germ. 70(58% in 5-25 d) and 40-70(57% in 3-20 d). Fresh seed germ. 70(2%)-40-70(41%) and 40-70(14%)-40-70. Seed DS 6 m 40 germ. 70(16%) and 40- 70(68%) showing an intermediate behavior.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Philadelphus p. 191. 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.