Deno’s Garden

Sequoiadendron giganteum

Genus Sequoiadendron

Two sources report 5 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Very 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 Light: dark

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

4% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Sequoiadendron p. 77Public domain
Show the original text
Sequoiadendron (Pinaceae). S. giganteum germ. 70D(22% in 2^4 w) and 40-70D(38% in 3-10 d). Seeds DS for 6 m at 70 germ. 70D(50% in 2-12 w) indicating that the seeds received in March stil! had not had enough DS, but seeds DS 2 y germ 70D(4%) and were largeiy dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Sequoiadendron p. 77. 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 September 27, 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 10 days to germinate.

38% germination in 3–10 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Sequoiadendron p. 77Public domain
Show the original text
Sequoiadendron (Pinaceae). S. giganteum germ. 70D(22% in 2^4 w) and 40-70D(38% in 3-10 d). Seeds DS for 6 m at 70 germ. 70D(50% in 2-12 w) indicating that the seeds received in March stil! had not had enough DS, but seeds DS 2 y germ 70D(4%) and were largeiy dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Sequoiadendron p. 77. 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 High Rated by us, not by the source.

Start around March 8, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 28 days to germinate.

22% germination in 28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Sequoiadendron p. 77Public domain
Show the original text
Sequoiadendron (Pinaceae). S. giganteum germ. 70D(22% in 2^4 w) and 40-70D(38% in 3-10 d). Seeds DS for 6 m at 70 germ. 70D(50% in 2-12 w) indicating that the seeds received in March stil! had not had enough DS, but seeds DS 2 y germ 70D(4%) and were largeiy dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Sequoiadendron p. 77. 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 16, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 15, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

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

50% germination in 14–84 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Sequoiadendron p. 77Public domain
Show the original text
Sequoiadendron (Pinaceae). S. giganteum germ. 70D(22% in 2^4 w) and 40-70D(38% in 3-10 d). Seeds DS for 6 m at 70 germ. 70D(50% in 2-12 w) indicating that the seeds received in March stil! had not had enough DS, but seeds DS 2 y germ 70D(4%) and were largeiy dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Sequoiadendron p. 77. 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 March 15, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

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

22% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Sequoiadendron p. 213Public domain
Show the original text
Sequoiadendron (Pinaceae). S. giganteum germ. 70D(22% in 2-4. w) and 40(none). GA-3 had no effect.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Sequoiadendron p. 213. 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.