Deno’s Garden

Penstemon monoensis

Genus Penstemon

This source reports 5 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Low Rated by us, not by the source.

Start around January 11, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing. Then 84 days to germinate.

100% germination in 56–84 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Penstemon p. 52Public domain
Show the original text
Penstemon (Scrophulariaceae). Some of the following data are updates on species reported in the 1st Suppl. As noted in the 2nd Ed. and 1st Suppl., 'there is a wide range of germination behaviors in this genus ranging from requirements for light, oscillating temperatures, low temperatures, and GA-3. P. monoensis germ. 70Lr40(5/5 in 8-12 w) and 40(2/9 in 6th w). The sample in 70D all rotted, but the sample was not large enough to be certain that light was the significant factor. Seeds DS 1 y germ. 40(7/9 in 4-12 w)-70D-40(1/9) and 70D-40(5/9 in 6-11 w)-70D-40-70D(1/9 on 2nd d). Seeds DS 2 y germ." 40(5/7 in 4-8 w) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Penstemon p. 52. 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 Moderate Rated by us, not by the source.

Start around October 14, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 13, 2025.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

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

  4. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    1/9 germinated in this phase.

Steps after step 2 run on after germination.

about 15 months from start to sowing. Then 84 days to germinate.

78% germination in 28–84 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Penstemon p. 52Public domain
Show the original text
Penstemon (Scrophulariaceae). Some of the following data are updates on species reported in the 1st Suppl. As noted in the 2nd Ed. and 1st Suppl., 'there is a wide range of germination behaviors in this genus ranging from requirements for light, oscillating temperatures, low temperatures, and GA-3. P. monoensis germ. 70Lr40(5/5 in 8-12 w) and 40(2/9 in 6th w). The sample in 70D all rotted, but the sample was not large enough to be certain that light was the significant factor. Seeds DS 1 y germ. 40(7/9 in 4-12 w)-70D-40(1/9) and 70D-40(5/9 in 6-11 w)-70D-40-70D(1/9 on 2nd d). Seeds DS 2 y germ." 40(5/7 in 4-8 w) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Penstemon p. 52. 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, 1998

Difficulty Low Rated by us, not by the source.

Start around February 9, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on February 8, 2025.

  1. Dry storage

    Duration: 730 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Temperature: 40°F 4°C

about 2 years from start to sowing. Then 56 days to germinate.

71% germination in 28–56 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Penstemon p. 52Public domain
Show the original text
Penstemon (Scrophulariaceae). Some of the following data are updates on species reported in the 1st Suppl. As noted in the 2nd Ed. and 1st Suppl., 'there is a wide range of germination behaviors in this genus ranging from requirements for light, oscillating temperatures, low temperatures, and GA-3. P. monoensis germ. 70Lr40(5/5 in 8-12 w) and 40(2/9 in 6th w). The sample in 70D all rotted, but the sample was not large enough to be certain that light was the significant factor. Seeds DS 1 y germ. 40(7/9 in 4-12 w)-70D-40(1/9) and 70D-40(5/9 in 6-11 w)-70D-40-70D(1/9 on 2nd d). Seeds DS 2 y germ." 40(5/7 in 4-8 w) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Penstemon p. 52. 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, 1998

Difficulty High Rated by us, not by the source.

Start around July 23, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 22, 2025.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Warm moist stratification

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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

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

  5. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  6. Warm moist stratification

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

    1/9 germinated in this phase.

Steps after step 3 run on after germination.

about 1.5 years from start to sowing. Then 77 days to germinate.

56% germination in 42–77 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Penstemon p. 52Public domain
Show the original text
Penstemon (Scrophulariaceae). Some of the following data are updates on species reported in the 1st Suppl. As noted in the 2nd Ed. and 1st Suppl., 'there is a wide range of germination behaviors in this genus ranging from requirements for light, oscillating temperatures, low temperatures, and GA-3. P. monoensis germ. 70Lr40(5/5 in 8-12 w) and 40(2/9 in 6th w). The sample in 70D all rotted, but the sample was not large enough to be certain that light was the significant factor. Seeds DS 1 y germ. 40(7/9 in 4-12 w)-70D-40(1/9) and 70D-40(5/9 in 6-11 w)-70D-40-70D(1/9 on 2nd d). Seeds DS 2 y germ." 40(5/7 in 4-8 w) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Penstemon p. 52. 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, 1998

Difficulty High Rated by us, not by the source.

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

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing. Then 42 days to germinate.

22% germination in 42 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Penstemon p. 52Public domain
Show the original text
Penstemon (Scrophulariaceae). Some of the following data are updates on species reported in the 1st Suppl. As noted in the 2nd Ed. and 1st Suppl., 'there is a wide range of germination behaviors in this genus ranging from requirements for light, oscillating temperatures, low temperatures, and GA-3. P. monoensis germ. 70Lr40(5/5 in 8-12 w) and 40(2/9 in 6th w). The sample in 70D all rotted, but the sample was not large enough to be certain that light was the significant factor. Seeds DS 1 y germ. 40(7/9 in 4-12 w)-70D-40(1/9) and 70D-40(5/9 in 6-11 w)-70D-40-70D(1/9 on 2nd d). Seeds DS 2 y germ." 40(5/7 in 4-8 w) and 70D(none).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Penstemon p. 52. 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.