Deno’s Garden

Polemonium caeruleum

Genus Polemonium

Two sources report 6 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing.

0% germination.

Nothing germinated at 70.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Polemonium p. 67Public domain
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Polemonium (Polemoniaceae). P. coeruleum alba germ. 70L(84% in 1-4 w) and none in 70D. This contrasts with the results reported for P. coeruleum where light if anything was slightly inhibitory. This needs to be reinvestigated particularly in light of a report from KW that P. coeruleum usually germ. at 70 but some forms were 40-70 germinators.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Polemonium p. 67. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.

Protocol 2

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. Sow and cover

    Temperature: 70°F 21°C Light: light

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

84% germination in 7–28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Polemonium p. 67Public domain
Show the original text
Polemonium (Polemoniaceae). P. coeruleum alba germ. 70L(84% in 1-4 w) and none in 70D. This contrasts with the results reported for P. coeruleum where light if anything was slightly inhibitory. This needs to be reinvestigated particularly in light of a report from KW that P. coeruleum usually germ. at 70 but some forms were 40-70 germinators.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Polemonium p. 67. 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 3

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.

52% germination in 7–28 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Polemonium p. 195Public domain
Show the original text
Polemonium (Polemoniaceae). The following germ: in 2-5 w at 70: P. coeruleum germ. 70(52% in 1-4w) and 40(none). P. coeruleum ssp villosum germ. 70D(82% in 2nd w), 70L(32% in 2nd w), and 40(8%)-70(4%). Modest differences such as this between 70D and 70L could possibly be a T effect as the seeds unavoidably heat up some because of light absorption.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Polemonium p. 195. 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 4

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 14 days to germinate.

82% germination in 14 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Polemonium p. 195Public domain
Show the original text
Polemonium (Polemoniaceae). The following germ: in 2-5 w at 70: P. coeruleum germ. 70(52% in 1-4w) and 40(none). P. coeruleum ssp villosum germ. 70D(82% in 2nd w), 70L(32% in 2nd w), and 40(8%)-70(4%). Modest differences such as this between 70D and 70L could possibly be a T effect as the seeds unavoidably heat up some because of light absorption.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Polemonium p. 195. 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 5

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 14 days to germinate.

32% germination in 14 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Polemonium p. 195Public domain
Show the original text
Polemonium (Polemoniaceae). The following germ: in 2-5 w at 70: P. coeruleum germ. 70(52% in 1-4w) and 40(none). P. coeruleum ssp villosum germ. 70D(82% in 2nd w), 70L(32% in 2nd w), and 40(8%)-70(4%). Modest differences such as this between 70D and 70L could possibly be a T effect as the seeds unavoidably heat up some because of light absorption.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Polemonium p. 195. 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 6

DerivedN. C. Deno, 1993

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

Start around December 15, 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

    4 germinated in this phase.

Steps after step 1 run on after germination.

about 3 months from start to sowing. Germination time not stated; 21 days assumed.

8% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Polemonium p. 195Public domain
Show the original text
Polemonium (Polemoniaceae). The following germ: in 2-5 w at 70: P. coeruleum germ. 70(52% in 1-4w) and 40(none). P. coeruleum ssp villosum germ. 70D(82% in 2nd w), 70L(32% in 2nd w), and 40(8%)-70(4%). Modest differences such as this between 70D and 70L could possibly be a T effect as the seeds unavoidably heat up some because of light absorption.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Polemonium p. 195. 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.