Deno’s Garden

Erythronium americanum

Genus Erythronium

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty High 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

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  4. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  5. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  6. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    5/12 germinated in this phase.

Steps after step 2 run on after germination.

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

58% germination in 70–84 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. americanum germ. in an extended pattern as shown by 70-40(7/12 in 10-12 w)-70-40-70-40(5/12 in 2nd w) and 40-70-40(3/19 in 9th w)-70(8/19 in one d to 5 w) using fresh seed. The cotyledons develop in 10 d on shifting to 70.
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 2

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around March 7, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 6, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    3/19 germinated in this phase.

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 12 months from start to sowing. Then 35 days to germinate.

42% germination in 35 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. americanum germ. in an extended pattern as shown by 70-40(7/12 in 10-12 w)-70-40-70-40(5/12 in 2nd w) and 40-70-40(3/19 in 9th w)-70(8/19 in one d to 5 w) using fresh seed. The cotyledons develop in 10 d on shifting to 70.
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.