Deno’s Garden

Primula cockburniana

Genus Primula

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around October 13, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

Steps after step 1 run on after germination.

about 3 months from start to sowing. Then 84 days to germinate.

56% germination in 56–84 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Primula p. 197Public domain
Show the original text
Primula. (Primulaceae). The discovery of a photorequirement in P. cockburniana (Can) germ. 70(53% in 1-4 w) and 40(56% in 8-12 w)-70(1 1% in 1 d).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Primula p. 197. 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

Difficulty Moderate Rated by us, not by the source.

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

  1. Sow and cover

    Temperature: 70°F 21°C

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

53% germination in 7–28 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Primula p. 197Public domain
Show the original text
Primula. (Primulaceae). The discovery of a photorequirement in P. cockburniana (Can) germ. 70(53% in 1-4 w) and 40(56% in 8-12 w)-70(1 1% in 1 d).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Primula p. 197. 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.