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Libertia grandiflora

Mikoikoi · New Zealand Iris

Family IridaceaeGenus Libertia

A rain-soaked head of white flowers with yellow anthers, above narrow green leaves
FlowerVelelaPublic domain

About the plant

What it is and where it grows — not part of any germination protocol.

Habit
tuberous geophytePlants of the World Online
Flower
WhiteWikipedia
Native range
New Zealand North, New Zealand SouthGBIF Backbone Taxonomy

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; Wikipedia — Wikipedia contributors; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

  • Mikoikoi, the New Zealand iris, grows wild only on the North Island; South Island plants once counted as this species are now a separate one. Wikipedia: Libertia grandiflora

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 October 14, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 13, 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 3 months from start to step 2. Germination happens during step 2, in 84 days.

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 December 30, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 29, 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 15 months from start to step 3. Germination happens during step 3, in 7 days.

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 December 22, 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 3 months from start to step 2. Germination happens during step 2, in 14 days.

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.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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