Deno’s Garden

Caltha biflora

Genus Caltha

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 August 20, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 19, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 6 months from start to sowing. Then 49 days to germinate.

12% germination in 49 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Caltha p. 110Public domain
Show the original text
Caltha (Ranunculaceae). C. biflora germ. 40-70(1/8 in 7th w) and none in 70-40.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Caltha p. 110. 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

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing.

0% germination.

Nothing germinated at 70.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Caltha p. 110Public domain
Show the original text
Caltha (Ranunculaceae). C. biflora germ. 40-70(1/8 in 7th w) and none in 70-40.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Caltha p. 110. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.