Deno’s Garden

Hydrophyllum capitatum

Genus Hydrophyllum

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around June 26, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 25, 2026.

  1. Gibberellic acid soak

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    43 germinated in this phase.

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  4. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 9 months from start to sowing. Then 14 days to germinate.

80% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Hydrophyllum p. 49Public domain
Show the original text
Hydrophyllum (Hydrophyllaceae). H. capitatum germ. 40(43% in 4-10 w) 70 GA-3-40(80% in 2nd w), and 70D-40(4%). About half the seeds died in DS 6 m 80% were dead after 2 y DS, and all were dead after 3 y DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Hydrophyllum p. 49. 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 Very high Rated by us, not by the source.

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 6 months from start to sowing. Germination time not stated; 21 days assumed.

4% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Hydrophyllum p. 49Public domain
Show the original text
Hydrophyllum (Hydrophyllaceae). H. capitatum germ. 40(43% in 4-10 w) 70 GA-3-40(80% in 2nd w), and 70D-40(4%). About half the seeds died in DS 6 m 80% were dead after 2 y DS, and all were dead after 3 y DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Hydrophyllum p. 49. 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.