Deno’s Garden

Trichostema dichotomum

Genus Trichostema

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty High Rated by us, not by the source.

Start around December 21, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 20, 2025.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Warm moist stratification

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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

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

about 15 months from start to sowing. Then 21 days to germinate.

66% germination in 21 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Trichostema p. 82Public domain
Show the original text
Trichostema (Lamiaceae). T. dichotomum is best germ. in 70 GA-3, 88% in 5-15 d for fresh seed and 100% in 4-8 d for seed DS 6 m. However, significant germination is obtainable in 40-70L(31% in 4-13 d), 70L-40-70L(66% in 3rd w), 70D- 40-70D(4%), and 10% in OT. DS 6 m or 12 m had littie effect, but seeds DS 3 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Trichostema p. 82. 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 March 29, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 28, 2026.

  1. Dry storage

    Duration: 180 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: light

about 12 months from start to sowing. Then 13 days to germinate.

31% germination in 4–13 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Trichostema p. 82Public domain
Show the original text
Trichostema (Lamiaceae). T. dichotomum is best germ. in 70 GA-3, 88% in 5-15 d for fresh seed and 100% in 4-8 d for seed DS 6 m. However, significant germination is obtainable in 40-70L(31% in 4-13 d), 70L-40-70L(66% in 3rd w), 70D- 40-70D(4%), and 10% in OT. DS 6 m or 12 m had littie effect, but seeds DS 3 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Trichostema p. 82. 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 High Rated by us, not by the source.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow outdoors and leave it

about 6 months from start to sowing.

10% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Trichostema p. 82Public domain
Show the original text
Trichostema (Lamiaceae). T. dichotomum is best germ. in 70 GA-3, 88% in 5-15 d for fresh seed and 100% in 4-8 d for seed DS 6 m. However, significant germination is obtainable in 40-70L(31% in 4-13 d), 70L-40-70L(66% in 3rd w), 70D- 40-70D(4%), and 10% in OT. DS 6 m or 12 m had littie effect, but seeds DS 3 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Trichostema p. 82. 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 Very high Rated by us, not by the source.

Start around December 21, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 20, 2025.

  1. Dry storage

    Duration: 180 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

about 15 months from start to sowing. Germination time not stated; 21 days assumed.

4% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Trichostema p. 82Public domain
Show the original text
Trichostema (Lamiaceae). T. dichotomum is best germ. in 70 GA-3, 88% in 5-15 d for fresh seed and 100% in 4-8 d for seed DS 6 m. However, significant germination is obtainable in 40-70L(31% in 4-13 d), 70L-40-70L(66% in 3rd w), 70D- 40-70D(4%), and 10% in OT. DS 6 m or 12 m had littie effect, but seeds DS 3 y were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Trichostema p. 82. 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.