Deno’s Garden

Ceanothus americanus

Genus Ceanothus

This source reports 4 treatments. All are shown.

Protocol 1

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

    1 germinated in this phase.

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 6 months from start to sowing. Then 21 days to germinate.

28% germination in 1–21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Ceanothus p. 114Public domain
Show the original text
Ceanothus (Rhamnaceae). C. americana seed was removed from the stiff husk. Germination is best (41%) in outdoor treatment with half of the germination occurring in September through November and the other half in March. A 40-70 treatment was almost as good as shown by 40(1%)-70(28% in 1-21 d), but 70(1%) was nearly fatal. Germination of seed DS 6 m at 40 or 70 was similar to fresh seed as shown by 70(5%)-40-70(8%) and 40(1%)-70(14% in 2-10 d)-40-70(3%). The results show that germination is promoted by oscillating temperatures.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Ceanothus p. 114. 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 High Rated by us, not by the source.

Start around September 27, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    1 germinated in this phase.

  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

    3 germinated in this phase.

Steps after step 2 run on after germination.

about 6 months from start to sowing. Then 10 days to germinate.

14% germination in 2–10 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Ceanothus p. 114Public domain
Show the original text
Ceanothus (Rhamnaceae). C. americana seed was removed from the stiff husk. Germination is best (41%) in outdoor treatment with half of the germination occurring in September through November and the other half in March. A 40-70 treatment was almost as good as shown by 40(1%)-70(28% in 1-21 d), but 70(1%) was nearly fatal. Germination of seed DS 6 m at 40 or 70 was similar to fresh seed as shown by 70(5%)-40-70(8%) and 40(1%)-70(14% in 2-10 d)-40-70(3%). The results show that germination is promoted by oscillating temperatures.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Ceanothus p. 114. 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 Very 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

    5 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.

8% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Ceanothus p. 114Public domain
Show the original text
Ceanothus (Rhamnaceae). C. americana seed was removed from the stiff husk. Germination is best (41%) in outdoor treatment with half of the germination occurring in September through November and the other half in March. A 40-70 treatment was almost as good as shown by 40(1%)-70(28% in 1-21 d), but 70(1%) was nearly fatal. Germination of seed DS 6 m at 40 or 70 was similar to fresh seed as shown by 70(5%)-40-70(8%) and 40(1%)-70(14% in 2-10 d)-40-70(3%). The results show that germination is promoted by oscillating temperatures.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Ceanothus p. 114. 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 Very high Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Germination time not stated; 21 days assumed.

1% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Ceanothus p. 114Public domain
Show the original text
Ceanothus (Rhamnaceae). C. americana seed was removed from the stiff husk. Germination is best (41%) in outdoor treatment with half of the germination occurring in September through November and the other half in March. A 40-70 treatment was almost as good as shown by 40(1%)-70(28% in 1-21 d), but 70(1%) was nearly fatal. Germination of seed DS 6 m at 40 or 70 was similar to fresh seed as shown by 70(5%)-40-70(8%) and 40(1%)-70(14% in 2-10 d)-40-70(3%). The results show that germination is promoted by oscillating temperatures.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Ceanothus p. 114. 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.