Deno’s Garden

Alnus hirsuta

Genus Alnus

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty High Rated by us, not by the source.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow outdoors and leave it

    Up in May and June.

about 6 months from start to sowing.

11% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Alnus p. 18Public domain
Show the original text
Alnus (Betulaceae). All samples were received in March, and had already undergone at least 6 m of DS and probably more. Since DS was clearly detrimental in A. hirsuta v. hirsuta (DS 6 m) germ. 70L(6% in 3rd w), 70 GA-3(5% in 2nd w), 70D(1 %)-40-70D(4% in 2nd w), 40-70D-40-70D(none), and 11% in May and June in OT. Seeds DS 1 y gave about the same results in 70L.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Alnus p. 18. 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 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: light

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

6% germination in 21 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Alnus p. 18Public domain
Show the original text
Alnus (Betulaceae). All samples were received in March, and had already undergone at least 6 m of DS and probably more. Since DS was clearly detrimental in A. hirsuta v. hirsuta (DS 6 m) germ. 70L(6% in 3rd w), 70 GA-3(5% in 2nd w), 70D(1 %)-40-70D(4% in 2nd w), 40-70D-40-70D(none), and 11% in May and June in OT. Seeds DS 1 y gave about the same results in 70L.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Alnus p. 18. 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 Very high Rated by us, not by the source.

Start around September 23, 2026 for a May 3 last frost.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Gibberellic acid soak

  3. Sow and cover

    Temperature: 70°F 21°C

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

5% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Alnus p. 18Public domain
Show the original text
Alnus (Betulaceae). All samples were received in March, and had already undergone at least 6 m of DS and probably more. Since DS was clearly detrimental in A. hirsuta v. hirsuta (DS 6 m) germ. 70L(6% in 3rd w), 70 GA-3(5% in 2nd w), 70D(1 %)-40-70D(4% in 2nd w), 40-70D-40-70D(none), and 11% in May and June in OT. Seeds DS 1 y gave about the same results in 70L.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Alnus p. 18. 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 Very high Rated by us, not by the source.

Start around December 28, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 27, 2025.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Warm moist stratification

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

    1 germinated in this phase.

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

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

about 15 months from start to sowing. Then 14 days to germinate.

4% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Alnus p. 18Public domain
Show the original text
Alnus (Betulaceae). All samples were received in March, and had already undergone at least 6 m of DS and probably more. Since DS was clearly detrimental in A. hirsuta v. hirsuta (DS 6 m) germ. 70L(6% in 3rd w), 70 GA-3(5% in 2nd w), 70D(1 %)-40-70D(4% in 2nd w), 40-70D-40-70D(none), and 11% in May and June in OT. Seeds DS 1 y gave about the same results in 70L.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Alnus p. 18. 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.