Deno’s Garden

Arum nigrum

Genus Arum

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate 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. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

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

100% germination in 7–21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Arum p. 15Public domain
Show the original text
Arum (Araceae). A. nigrum germ. 70D(1/9 in 7th w)-40(2/9 in 4th w) and 40-70D-40(4/4 in 1-3 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Arum p. 15. 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 September 10, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 9, 2026.

  1. Warm moist stratification

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

    1/9 germinated in this phase.

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 6 months from start to sowing. Then 28 days to germinate.

22% germination in 28 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Arum p. 15Public domain
Show the original text
Arum (Araceae). A. nigrum germ. 70D(1/9 in 7th w)-40(2/9 in 4th w) and 40-70D-40(4/4 in 1-3 w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Arum p. 15. 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.