Deno’s Garden

Helleborus orientalis

Genus Helleborus

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around April 24, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on April 23, 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

about 9 months from start to sowing. Then 77 days to germinate.

100% germination in 42–77 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Helleborus p. 151Public domain
Show the original text
Helleborus (Ranunculaceae). - H. orientalis germ. 70-40(100% in 5-10 w) and 40-70-40(100% in 6-11 w).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Helleborus p. 151. 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 Moderate Rated by us, not by the source.

Start around July 30, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 29, 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 70 days to germinate.

100% germination in 35–70 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Helleborus p. 151Public domain
Show the original text
Helleborus (Ranunculaceae). - H. orientalis germ. 70-40(100% in 5-10 w) and 40-70-40(100% in 6-11 w).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Helleborus p. 151. 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.