Deno’s Garden

Erythronium hendersonii

Genus Erythronium

Two sources report 4 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around January 11, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing. Then 84 days to germinate.

86% germination in 63–84 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Erythronium p. 42Public domain
Show the original text
Erythronium (Liliaceae). E. hendersonii x citrinum germ. 40(86% in 9-12 w) and 70-40(87% in 8-12 w). This is identical to the pattern for E. hendersonii.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Erythronium p. 42. 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 July 16, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 15, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

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

87% germination in 56–84 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Erythronium p. 42Public domain
Show the original text
Erythronium (Liliaceae). E. hendersonii x citrinum germ. 40(86% in 9-12 w) and 70-40(87% in 8-12 w). This is identical to the pattern for E. hendersonii.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Erythronium p. 42. 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 October 13, 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

    7 germinated in this phase.

Steps after step 1 run on after germination.

about 3 months from start to sowing. Then 84 days to germinate.

93% germination in 56–84 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Erythronium p. 140Public domain
Show the original text
Erythronium (Liliaceae). E. hendersoni germ. 40(93% in 8-12 w)-70(7% on 2nd d) and 70-40(80% in 11th w)-70(20% on 2nd d) using fresh seed.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Erythronium p. 140. 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 Moderate Rated by us, not by the source.

Start around July 23, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 22, 2026.

  1. Warm moist stratification

    Duration: 90 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

    20 germinated in this phase.

Steps after step 2 run on after germination.

about 6 months from start to sowing. Then 77 days to germinate.

80% germination in 77 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Erythronium p. 140Public domain
Show the original text
Erythronium (Liliaceae). E. hendersoni germ. 40(93% in 8-12 w)-70(7% on 2nd d) and 70-40(80% in 11th w)-70(20% on 2nd d) using fresh seed.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Erythronium p. 140. 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.