Deno’s Garden

Ruellia humilis

Genus Ruellia

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around June 19, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 18, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    4 germinated in this phase.

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 9 months from start to sowing. Germination time not stated; 21 days assumed.

17% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Ruellia p. 208Public domain
Show the original text
Ruellia (Acanthaceae). A. humilis requires either a period at 40 or GA-3 to effect germination at 70. Using the 40-70 procedure, the maximum 100% germination is achieved only if the time at 40 is 14 w. Shorter and longer times at 40 give reduced germination. For times at 40 of 0, 4, 6, 8, 10,12, 14, 18, and 22 weeks the respective percent germinations on shifting to 70 were 0, 2%, 6%, 27%, 29%, 47%,100%, 75%, and 88%. Germination is complete in 2-5 d after the shift to 70. Fresh seed and seed DS 6 m at 70 gave similar results. With GA-3 germination is 71% in 5-9 d at 70. Without the GA-3 treatment, sowing the seed at 70 is detrimental as shown by 70(4%)- 40-70(17%) for fresh seed and 70-40-70(2%) for seed DS 6 m at 70 or 40.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Ruellia p. 208. 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 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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

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

2% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Ruellia p. 208Public domain
Show the original text
Ruellia (Acanthaceae). A. humilis requires either a period at 40 or GA-3 to effect germination at 70. Using the 40-70 procedure, the maximum 100% germination is achieved only if the time at 40 is 14 w. Shorter and longer times at 40 give reduced germination. For times at 40 of 0, 4, 6, 8, 10,12, 14, 18, and 22 weeks the respective percent germinations on shifting to 70 were 0, 2%, 6%, 27%, 29%, 47%,100%, 75%, and 88%. Germination is complete in 2-5 d after the shift to 70. Fresh seed and seed DS 6 m at 70 gave similar results. With GA-3 germination is 71% in 5-9 d at 70. Without the GA-3 treatment, sowing the seed at 70 is detrimental as shown by 70(4%)- 40-70(17%) for fresh seed and 70-40-70(2%) for seed DS 6 m at 70 or 40.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Ruellia p. 208. 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.