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Arum concinnatum

Elaborated Arum

Family AraceaeGenus Arum

An upright spathe streaked purple and gray, its fold open just enough to show the yellow spadix inside, among broad arrow-shaped leaves
FlowerJerzy StrzeleckiCC BY-SA 3.0

About the plant

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

Habit
tuberous geophytePlants of the World Online
Flower
PurpleRead from the photograph on this page
Native range
East Aegean Is., Greece, Kriti, TürkiyeGBIF 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 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

Start around December 16, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 15, 2025.

  1. Dry storage

    Duration: 365 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

about 15 months from start to step 3. Germination happens during step 3, in 21 days.

86% germination in 21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Arum p. 15Public domain
Show the original text
Arum (Araceae). A. concinnatum germ. 70D(75% in 3-13 w)-40(25% in 3rd w) and 40(10%)-70D- 40(50% in 4th w). Seeds DS 1 y germ. 70D(60% in 8-12 w)-40(30% in 6th w) similar to the fresh seeds, but seeds DS 2 y germ. 70D-40(6/7 in 3rd w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Arum p. 15. 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 January 4, 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

    25 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1, in 91 days.

75% germination in 21–91 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Arum p. 15Public domain
Show the original text
Arum (Araceae). A. concinnatum germ. 70D(75% in 3-13 w)-40(25% in 3rd w) and 40(10%)-70D- 40(50% in 4th w). Seeds DS 1 y germ. 70D(60% in 8-12 w)-40(30% in 6th w) similar to the fresh seeds, but seeds DS 2 y germ. 70D-40(6/7 in 3rd w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Arum p. 15. 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 Moderate Rated by us, not by the source.

Start around January 12, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on January 11, 2026.

  1. Dry storage

    Duration: 365 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

    30 germinated in this phase.

Steps after step 2 run on after germination.

about 12 months from start to step 2. Germination happens during step 2, in 84 days.

60% germination in 56–84 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Arum p. 15Public domain
Show the original text
Arum (Araceae). A. concinnatum germ. 70D(75% in 3-13 w)-40(25% in 3rd w) and 40(10%)-70D- 40(50% in 4th w). Seeds DS 1 y germ. 70D(60% in 8-12 w)-40(30% in 6th w) similar to the fresh seeds, but seeds DS 2 y germ. 70D-40(6/7 in 3rd w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Arum p. 15. 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 High Rated by us, not by the source.

Start around September 10, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 9, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    10 germinated in this phase.

  2. Warm moist stratification

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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 6 months from start to step 3. Germination happens during step 3, in 28 days.

50% germination in 28 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Arum p. 15Public domain
Show the original text
Arum (Araceae). A. concinnatum germ. 70D(75% in 3-13 w)-40(25% in 3rd w) and 40(10%)-70D- 40(50% in 4th w). Seeds DS 1 y germ. 70D(60% in 8-12 w)-40(30% in 6th w) similar to the fresh seeds, but seeds DS 2 y germ. 70D-40(6/7 in 3rd w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Arum p. 15. 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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