Deno’s Garden

Dendromecon rigida

Genus Dendromecon

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around August 27, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 26, 2026.

  1. Gibberellic acid soak

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    20 germinated in this phase.

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 6 months from start to sowing. Then 42 days to germinate.

40% germination in 21–42 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Dendromecon p. 38Public domain
Show the original text
Dendromecon (Papaveraceae). D. rigida germ. 70 GA-3(20% in 4-7 w)- 40(40% in 3-6 w) and none in 70L, 70D, 40-70, or OT (after one y). The seeds expand and split first. The radicle does not appear until a week later followed by expansion of the cotyledons in two days. Seeds that had been DS at 40 for 3 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Dendromecon p. 38. 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

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing.

0% germination.

Nothing germinated at 70.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Dendromecon p. 38Public domain
Show the original text
Dendromecon (Papaveraceae). D. rigida germ. 70 GA-3(20% in 4-7 w)- 40(40% in 3-6 w) and none in 70L, 70D, 40-70, or OT (after one y). The seeds expand and split first. The radicle does not appear until a week later followed by expansion of the cotyledons in two days. Seeds that had been DS at 40 for 3 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Dendromecon p. 38. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.

Protocol 3

DerivedN. C. Deno, 1996

Difficulty Very high Rated by us, not by the source.

  1. Sow outdoors and leave it

    Nothing germinated outdoors.

No stated waiting before sowing.

0% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Dendromecon p. 38Public domain
Show the original text
Dendromecon (Papaveraceae). D. rigida germ. 70 GA-3(20% in 4-7 w)- 40(40% in 3-6 w) and none in 70L, 70D, 40-70, or OT (after one y). The seeds expand and split first. The radicle does not appear until a week later followed by expansion of the cotyledons in two days. Seeds that had been DS at 40 for 3 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Dendromecon p. 38. 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.