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Calydorea xiphioides

Tahay

Family IridaceaeGenus Calydorea

A blue six-petalled flower with a bright yellow center and a dark mark at the base of each petal, low in dry grass
FlowerpabloendemicoCC BY 2.0

About the plant

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

Habit
bulbous geophytePlants of the World Online
Flower
BlueRead from the photograph on this page
Native range
Chile CentralGBIF 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; Read from the photograph on this page — Deno's Garden; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports 6 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

Start around November 10, 2026 for a May 3 last frost.

  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 56 days.

80% germination in 56 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Calydorea p. 21Public domain
Show the original text
Calydorea (Iridaceae). Except for C. xiphioides germ. 70L-40(80% in 8th w) and 70D-40-70D(5/7 in 3-11 d). The two results are not as disparate as might seem since germination of the seeds in 70D- 40-70D was incipient after the 3 m at 40. Nevertheless there does appear to be another example of a delayed light effect. Seeds DS 1 y germ. 70L-40(22% in 2nd w)- 70L(12% on 4th d) and 70D-40(none) confirming the delayed light effect. *
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Calydorea p. 21. 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 Moderate Rated by us, not by the source.

Start around September 27, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 26, 2026.

  1. Warm moist stratification

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

  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 6 months from start to step 3. Germination happens during step 3, in 11 days.

71% germination in 3–11 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Calydorea p. 21Public domain
Show the original text
Calydorea (Iridaceae). Except for C. xiphioides germ. 70L-40(80% in 8th w) and 70D-40-70D(5/7 in 3-11 d). The two results are not as disparate as might seem since germination of the seeds in 70D- 40-70D was incipient after the 3 m at 40. Nevertheless there does appear to be another example of a delayed light effect. Seeds DS 1 y germ. 70L-40(22% in 2nd w)- 70L(12% on 4th d) and 70D-40(none) confirming the delayed light effect. *
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Calydorea p. 21. 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 January 18, 2027 for a May 3 last frost.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    15 germinated in this phase.

  3. Warm moist stratification

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

    15 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1, in 77 days.

54% germination in 28–77 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Calydorea p. 21Public domain
Show the original text
Calydorea (Iridaceae). Except for C. speciosa germ. 70D(54% in 4-11 w)-40(15% in 8th w)-70D(15% on 3rd d), 70L(none), 40-70D(45% in 2nd w), and 40-70L(4%)-40(7%)-70D(35% in 2-7 d). When the sample in 70L was shifted to 70D after 9 w, 83% germ. in 6-10 d, and 11% more germ. after 3 m in 70D and a shift to 40.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Calydorea p. 21. 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, 1998

Difficulty Moderate 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: dark

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

45% germination in 14 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Calydorea p. 21Public domain
Show the original text
Calydorea (Iridaceae). Except for C. speciosa germ. 70D(54% in 4-11 w)-40(15% in 8th w)-70D(15% on 3rd d), 70L(none), 40-70D(45% in 2nd w), and 40-70L(4%)-40(7%)-70D(35% in 2-7 d). When the sample in 70L was shifted to 70D after 9 w, 83% germ. in 6-10 d, and 11% more germ. after 3 m in 70D and a shift to 40.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Calydorea p. 21. 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, 1998

Difficulty High Rated by us, not by the source.

Start around July 3, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 2, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

    4 germinated in this phase.

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    7 germinated in this phase.

  4. Warm moist stratification

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

about 9 months from start to step 4. Germination happens during step 4, in 7 days.

35% germination in 2–7 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Calydorea p. 21Public domain
Show the original text
Calydorea (Iridaceae). Except for C. speciosa germ. 70D(54% in 4-11 w)-40(15% in 8th w)-70D(15% on 3rd d), 70L(none), 40-70D(45% in 2nd w), and 40-70L(4%)-40(7%)-70D(35% in 2-7 d). When the sample in 70L was shifted to 70D after 9 w, 83% germ. in 6-10 d, and 11% more germ. after 3 m in 70D and a shift to 40.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Calydorea p. 21. 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, 1998

Difficulty High Rated by us, not by the source.

Start around December 23, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 22, 2025.

  1. Dry storage

    Duration: 365 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

    12 germinated in this phase.

Steps after step 3 run on after germination.

about 15 months from start to step 3. Germination happens during step 3, in 14 days.

22% germination in 14 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Calydorea p. 21Public domain
Show the original text
Calydorea (Iridaceae). Except for C. xiphioides germ. 70L-40(80% in 8th w) and 70D-40-70D(5/7 in 3-11 d). The two results are not as disparate as might seem since germination of the seeds in 70D- 40-70D was incipient after the 3 m at 40. Nevertheless there does appear to be another example of a delayed light effect. Seeds DS 1 y germ. 70L-40(22% in 2nd w)- 70L(12% on 4th d) and 70D-40(none) confirming the delayed light effect. *
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Calydorea p. 21. 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

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