Deno’s Garden

Keckiella corymbosa

Genus Keckiella

This source reports 6 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

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

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C

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

63% germination in 7–21 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Penstemon p. 64Public domain
Show the original text
Penstemon (Scrophulariaceae). P. corymbosus (syn. Keckiella corymbosus) germination was improved by DS 6 m at 70. The DS seed germ. 70L(50% in 1-3 w), 70D(15%), and 40(30% in 8th w). Fresh seed geim. 70D(13% in 1-11 w), 70L(40% in 1-7 w), 70 GA-3(63% in 1-3 w), and 40-70D(22% in 8th w)-70(20% on 3rd d). Seeds DS 1 y germ. 70D(35% in 2-4 w) and 70L(29% in 2-4 w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Penstemon p. 64. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around February 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 49 days to germinate.

40% germination in 7–49 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Penstemon p. 64Public domain
Show the original text
Penstemon (Scrophulariaceae). P. corymbosus (syn. Keckiella corymbosus) germination was improved by DS 6 m at 70. The DS seed germ. 70L(50% in 1-3 w), 70D(15%), and 40(30% in 8th w). Fresh seed geim. 70D(13% in 1-11 w), 70L(40% in 1-7 w), 70 GA-3(63% in 1-3 w), and 40-70D(22% in 8th w)-70(20% on 3rd d). Seeds DS 1 y germ. 70D(35% in 2-4 w) and 70L(29% in 2-4 w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Penstemon p. 64. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 9, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 8, 2026.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 12 months from start to sowing. Then 28 days to germinate.

35% germination in 14–28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Penstemon p. 64Public domain
Show the original text
Penstemon (Scrophulariaceae). P. corymbosus (syn. Keckiella corymbosus) germination was improved by DS 6 m at 70. The DS seed germ. 70L(50% in 1-3 w), 70D(15%), and 40(30% in 8th w). Fresh seed geim. 70D(13% in 1-11 w), 70L(40% in 1-7 w), 70 GA-3(63% in 1-3 w), and 40-70D(22% in 8th w)-70(20% on 3rd d). Seeds DS 1 y germ. 70D(35% in 2-4 w) and 70L(29% in 2-4 w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Penstemon p. 64. 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, 1996

Difficulty High Rated by us, not by the source.

Start around March 9, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 8, 2026.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 12 months from start to sowing. Then 28 days to germinate.

29% germination in 14–28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Penstemon p. 64Public domain
Show the original text
Penstemon (Scrophulariaceae). P. corymbosus (syn. Keckiella corymbosus) germination was improved by DS 6 m at 70. The DS seed germ. 70L(50% in 1-3 w), 70D(15%), and 40(30% in 8th w). Fresh seed geim. 70D(13% in 1-11 w), 70L(40% in 1-7 w), 70 GA-3(63% in 1-3 w), and 40-70D(22% in 8th w)-70(20% on 3rd d). Seeds DS 1 y germ. 70D(35% in 2-4 w) and 70L(29% in 2-4 w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Penstemon p. 64. 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, 1996

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. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    20 germinated in this phase.

Steps after step 2 run on after germination.

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

22% germination in 56 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Penstemon p. 64Public domain
Show the original text
Penstemon (Scrophulariaceae). P. corymbosus (syn. Keckiella corymbosus) germination was improved by DS 6 m at 70. The DS seed germ. 70L(50% in 1-3 w), 70D(15%), and 40(30% in 8th w). Fresh seed geim. 70D(13% in 1-11 w), 70L(40% in 1-7 w), 70 GA-3(63% in 1-3 w), and 40-70D(22% in 8th w)-70(20% on 3rd d). Seeds DS 1 y germ. 70D(35% in 2-4 w) and 70L(29% in 2-4 w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Penstemon p. 64. 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, 1996

Difficulty High 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: dark

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

13% germination in 7–77 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Penstemon p. 64Public domain
Show the original text
Penstemon (Scrophulariaceae). P. corymbosus (syn. Keckiella corymbosus) germination was improved by DS 6 m at 70. The DS seed germ. 70L(50% in 1-3 w), 70D(15%), and 40(30% in 8th w). Fresh seed geim. 70D(13% in 1-11 w), 70L(40% in 1-7 w), 70 GA-3(63% in 1-3 w), and 40-70D(22% in 8th w)-70(20% on 3rd d). Seeds DS 1 y germ. 70D(35% in 2-4 w) and 70L(29% in 2-4 w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Penstemon p. 64. 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.