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Chaloupkaea aizoon

Juicy Rock Navel

Family CrassulaceaeGenus Chaloupkaea

Also published as Prometheum aizoon, Rosularia pallida. You are in the right place.

Tight rosettes of fleshy leaves wedged in a rock crack, with starry pale yellow flowers
FlowerDmitry LyskovCC0

About the plant

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

Habit
succulent perennialPlants of the World Online
Flower
Pale yellowRead from the photograph on this page

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.

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around June 28, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 27, 2026.

  1. Dry storage

    Duration: 240 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 8 months from start to sowing. Then 42 days to germinate.

51% germination in 7–42 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Rosularia p. 72Public domain
Show the original text
Rosularia (Crassulaceae). R. pallida DS 8 m germ. 70D(45% in 1-11 w), 70L(51% in 1-6 w), 70 GA-3(none), and 40-70D(14%). Seeds DS 18 m were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Rosularia p. 72. 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, 1996

Difficulty Moderate Rated by us, not by the source.

Start around May 24, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on May 23, 2026.

  1. Dry storage

    Duration: 240 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 8 months from start to sowing. Then 77 days to germinate.

45% germination in 7–77 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Rosularia p. 72Public domain
Show the original text
Rosularia (Crassulaceae). R. pallida DS 8 m germ. 70D(45% in 1-11 w), 70L(51% in 1-6 w), 70 GA-3(none), and 40-70D(14%). Seeds DS 18 m were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Rosularia p. 72. 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, 1996

Difficulty High Rated by us, not by the source.

Start around April 20, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on April 19, 2026.

  1. Dry storage

    Duration: 240 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 11 months from start to step 3. Germination happens during step 3; time not stated, 21 days assumed.

14% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Rosularia p. 72Public domain
Show the original text
Rosularia (Crassulaceae). R. pallida DS 8 m germ. 70D(45% in 1-11 w), 70L(51% in 1-6 w), 70 GA-3(none), and 40-70D(14%). Seeds DS 18 m were dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Rosularia p. 72. 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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