Deno’s Garden

Libertia grandiflora

Genus Libertia

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

Start around July 16, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 15, 2026.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 6 months from start to sowing. Then 84 days to germinate.

30% germination in 56–84 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Libertia p. 44Public domain
Show the original text
Libertia (Iridaceae). L. grandiflora germ. 70D-40(none), 70L-40(3/10 in 8-12 w), 40-70L(1/4 in 2nd w), and 40-70D{none). Seeds DS 1 y germ. 70D-40{1/8 in 11th w) and 40-70D(3/11 in 2-7 d).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Libertia p. 44. 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 High Rated by us, not by the source.

Start around October 1, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 30, 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

about 1.5 years from start to sowing. Then 7 days to germinate.

27% germination in 2–7 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Libertia p. 44Public domain
Show the original text
Libertia (Iridaceae). L. grandiflora germ. 70D-40(none), 70L-40(3/10 in 8-12 w), 40-70L(1/4 in 2nd w), and 40-70D{none). Seeds DS 1 y germ. 70D-40{1/8 in 11th w) and 40-70D(3/11 in 2-7 d).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Libertia p. 44. 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 High Rated by us, not by the source.

Start around September 23, 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 14 days to germinate.

25% germination in 14 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Libertia p. 44Public domain
Show the original text
Libertia (Iridaceae). L. grandiflora germ. 70D-40(none), 70L-40(3/10 in 8-12 w), 40-70L(1/4 in 2nd w), and 40-70D{none). Seeds DS 1 y germ. 70D-40{1/8 in 11th w) and 40-70D(3/11 in 2-7 d).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Libertia p. 44. 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.