Deno’s Garden

Polemonium chartaceum

Genus Polemonium

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty High Rated by us, not by the source.

Start around August 13, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 12, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 6 months from start to sowing. Then 56 days to germinate.

27% germination in 56 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Polemonium p. 55Public domain
Show the original text
Polemonium (Polemoniaceae). P. chartaceum germ. 70(GA-3)-40(4/15 in 8th w) and 40-70D(1/32). None germ. starting in 70D-40 or 70L-40. .
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Polemonium p. 55. 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, 1998

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

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

about 6 months from start to sowing. Germination time not stated; 21 days assumed.

3% germination.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Polemonium p. 55Public domain
Show the original text
Polemonium (Polemoniaceae). P. chartaceum germ. 70(GA-3)-40(4/15 in 8th w) and 40-70D(1/32). None germ. starting in 70D-40 or 70L-40. .
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Polemonium p. 55. 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.