Deno’s Garden

Sorbus americana

Genus Sorbus

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Low Rated by us, not by the source.

  1. Sow outdoors and leave it

    Up in April.

No stated waiting before sowing.

80% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Sorbus p. 62Public domain
Show the original text
Sorbus (Rosaceae). S. americana germ. 40-70D(26% in 1-8 w), 70D-40- 70D(16% in 1-3 w), and OT(80% in April). Germination was not initiatëd by GA-3. Seeds DS 6 m germ. 40-70D(29% in 1-3 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Sorbus p. 62. 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 High 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 Light: dark

about 12 months from start to sowing. Then 21 days to germinate.

29% germination in 7–21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Sorbus p. 62Public domain
Show the original text
Sorbus (Rosaceae). S. americana germ. 40-70D(26% in 1-8 w), 70D-40- 70D(16% in 1-3 w), and OT(80% in April). Germination was not initiatëd by GA-3. Seeds DS 6 m germ. 40-70D(29% in 1-3 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Sorbus p. 62. 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 High 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, 2026.

  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 56 days to germinate.

26% germination in 7–56 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Sorbus p. 62Public domain
Show the original text
Sorbus (Rosaceae). S. americana germ. 40-70D(26% in 1-8 w), 70D-40- 70D(16% in 1-3 w), and OT(80% in April). Germination was not initiatëd by GA-3. Seeds DS 6 m germ. 40-70D(29% in 1-3 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Sorbus p. 62. 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 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 Light: dark

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

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

about 9 months from start to sowing. Then 21 days to germinate.

16% germination in 7–21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Sorbus p. 62Public domain
Show the original text
Sorbus (Rosaceae). S. americana germ. 40-70D(26% in 1-8 w), 70D-40- 70D(16% in 1-3 w), and OT(80% in April). Germination was not initiatëd by GA-3. Seeds DS 6 m germ. 40-70D(29% in 1-3 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Sorbus p. 62. 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.