Deno’s Garden

Polemonium viscosum

Genus Polemonium

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around March 26, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 10 days to germinate.

42% germination in 4–10 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. viscosum germ. 70(42% in 4-10 d) and 40(19% in 3-8 w)-70. It is unusual for such a high alpine species to show immediate germination at 70.
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 2

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 21 days to germinate.

25% germination in 21 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. grayanum germ. 70L(25% in 3rd w), 70D(5%), and none in 700-40-70L indicating that light promotes germination.
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 3

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around November 10, 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 56 days to germinate.

19% germination in 21–56 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. viscosum germ. 70(42% in 4-10 d) and 40(19% in 3-8 w)-70. It is unusual for such a high alpine species to show immediate germination at 70.
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 Very high Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Germination time not stated; 21 days assumed.

5% 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. grayanum germ. 70L(25% in 3rd w), 70D(5%), and none in 700-40-70L indicating that light promotes germination.
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.