Deno’s Garden

Collomia grandiflora

Genus Collomia

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 8, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing. Then 28 days to germinate.

90% germination in 14–28 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Collomia p. 32Public domain
Show the original text
Collomia (Polemoniaaceae). C. grandiflora had been studied before. A new sample germ/70D(70% in 2-14 d)-40(30%) and 40(90% in 2-4 w). This is in essential agreement with the earlier work. Two other species studied earlier require GA-3 for germination, but GA-3 caused total rotting in C. grandiflora.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Collomia p. 32. 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 Moderate Rated by us, not by the source.

Start around December 22, 2026 for a May 3 last frost.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    30 germinated in this phase.

Steps after step 1 run on after germination.

about 3 months from start to sowing. Then 14 days to germinate.

70% germination in 2–14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Collomia p. 32Public domain
Show the original text
Collomia (Polemoniaaceae). C. grandiflora had been studied before. A new sample germ/70D(70% in 2-14 d)-40(30%) and 40(90% in 2-4 w). This is in essential agreement with the earlier work. Two other species studied earlier require GA-3 for germination, but GA-3 caused total rotting in C. grandiflora.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Collomia p. 32. 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.