Deno’s Garden

Penstemon hirsutus

Genus Penstemon

This source reports 5 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around September 29, 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 Light: light

about 6 months from start to sowing. Then 8 days to germinate.

71% germination in 4–8 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Penstemon p. 187Public domain
Show the original text
Penstemon (Scrophulariaceae). Four types of germination were observed. Most Rocky Mountain species of a perennial nature germ. largely at 40 and often sowing at 70 was fatal or near fatal. A second group are short lived species that can flower the first year from seed typified by P. hirsutus requires light for germination, and germination is promoted by a preliminary 3 m at 40. Seeds germ. 40-70L(71% in 4-8 d), 70L(6% in 1-6 w), 70D(none), and 40-70D(none) using fresh seed or seed DS 6 m at 70. P. hirsutus pygmaea requires light. Fresh seed or seed IDS m at 70 germ. 70L(65% in 1-11 w), 40-70L(56% in 4-8 d), and none in 70D or 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Penstemon p. 187. 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 January 18, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 77 days to germinate.

65% germination in 7–77 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Penstemon p. 187Public domain
Show the original text
Penstemon (Scrophulariaceae). Four types of germination were observed. Most Rocky Mountain species of a perennial nature germ. largely at 40 and often sowing at 70 was fatal or near fatal. A second group are short lived species that can flower the first year from seed typified by P. hirsutus requires light for germination, and germination is promoted by a preliminary 3 m at 40. Seeds germ. 40-70L(71% in 4-8 d), 70L(6% in 1-6 w), 70D(none), and 40-70D(none) using fresh seed or seed DS 6 m at 70. P. hirsutus pygmaea requires light. Fresh seed or seed IDS m at 70 germ. 70L(65% in 1-11 w), 40-70L(56% in 4-8 d), and none in 70D or 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Penstemon p. 187. 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 September 29, 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 Light: light

about 6 months from start to sowing. Then 8 days to germinate.

56% germination in 4–8 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Penstemon p. 187Public domain
Show the original text
Penstemon (Scrophulariaceae). Four types of germination were observed. Most Rocky Mountain species of a perennial nature germ. largely at 40 and often sowing at 70 was fatal or near fatal. A second group are short lived species that can flower the first year from seed typified by P. hirsutus requires light for germination, and germination is promoted by a preliminary 3 m at 40. Seeds germ. 40-70L(71% in 4-8 d), 70L(6% in 1-6 w), 70D(none), and 40-70D(none) using fresh seed or seed DS 6 m at 70. P. hirsutus pygmaea requires light. Fresh seed or seed IDS m at 70 germ. 70L(65% in 1-11 w), 40-70L(56% in 4-8 d), and none in 70D or 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Penstemon p. 187. 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 February 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 42 days to germinate.

6% germination in 7–42 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Penstemon p. 187Public domain
Show the original text
Penstemon (Scrophulariaceae). Four types of germination were observed. Most Rocky Mountain species of a perennial nature germ. largely at 40 and often sowing at 70 was fatal or near fatal. A second group are short lived species that can flower the first year from seed typified by P. hirsutus requires light for germination, and germination is promoted by a preliminary 3 m at 40. Seeds germ. 40-70L(71% in 4-8 d), 70L(6% in 1-6 w), 70D(none), and 40-70D(none) using fresh seed or seed DS 6 m at 70. P. hirsutus pygmaea requires light. Fresh seed or seed IDS m at 70 germ. 70L(65% in 1-11 w), 40-70L(56% in 4-8 d), and none in 70D or 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Penstemon p. 187. 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

  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, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Penstemon p. 187Public domain
Show the original text
Penstemon (Scrophulariaceae). Four types of germination were observed. Most Rocky Mountain species of a perennial nature germ. largely at 40 and often sowing at 70 was fatal or near fatal. A second group are short lived species that can flower the first year from seed typified by P. hirsutus requires light for germination, and germination is promoted by a preliminary 3 m at 40. Seeds germ. 40-70L(71% in 4-8 d), 70L(6% in 1-6 w), 70D(none), and 40-70D(none) using fresh seed or seed DS 6 m at 70. P. hirsutus pygmaea requires light. Fresh seed or seed IDS m at 70 germ. 70L(65% in 1-11 w), 40-70L(56% in 4-8 d), and none in 70D or 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Penstemon p. 187. Quoted exactly. Every value on this card comes from this record; the step names come from a fixed list.