Deno’s GardenMy Garden

Arum cyrenaicum

Libyan Arum

Family AraceaeGenus Arum

A hooded spathe, purple outside and pale inside, wrapped around a yellow spadix, among rocks
FlowerPictured: Arum concinnatum, a relativezebedeugalinhaCC BY 4.0

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
Kriti, LibyaGBIF 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.

Worth knowing

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

Start around September 3, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 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: 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 35 days.

75% germination in 35 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. cyrenaicum germ. 70D(5/8 in 9-14 w) and 40-70D-40(3/4 in 5th w). The sample in 70D was kept at 70 beyond the usual 3 m because of the continuing germination.
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 December 28, 2026 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 98 days to germinate.

62% germination in 63–98 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. cyrenaicum germ. 70D(5/8 in 9-14 w) and 40-70D-40(3/4 in 5th w). The sample in 70D was kept at 70 beyond the usual 3 m because of the continuing germination.
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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