Deno’s Garden

Petrosedum subulatum

Genus Petrosedum

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around March 16, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 20 days to germinate.

30% germination in 11–20 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Sedum p. 213Public domain
Show the original text
Sedum (Crassulaceae). All Sedums tolerated OS and germ. largely at 70. Germination in S. subulatum germ. 70(30% in 11-20 d) and 40(5%)-70(10%). Seed sown outdoors in November germ. 22%, partly in November and partly in February during a warm spell.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Sedum p. 213. 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, 1993

Difficulty High Rated by us, not by the source.

Sow around November 2026 — a date the source gives, not one counted back from a May 3 last frost.

  1. Sow outdoors and leave it

    Sown outdoors in November.

No stated waiting before sowing. Germination time not stated; 21 days assumed.

22% germination.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Sedum p. 213Public domain
Show the original text
Sedum (Crassulaceae). All Sedums tolerated OS and germ. largely at 70. Germination in S. subulatum germ. 70(30% in 11-20 d) and 40(5%)-70(10%). Seed sown outdoors in November germ. 22%, partly in November and partly in February during a warm spell.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Sedum p. 213. 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, 1993

Difficulty High Rated by us, not by the source.

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    5 germinated in this phase.

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 6 months from start to sowing. Germination time not stated; 21 days assumed.

10% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Sedum p. 213Public domain
Show the original text
Sedum (Crassulaceae). All Sedums tolerated OS and germ. largely at 70. Germination in S. subulatum germ. 70(30% in 11-20 d) and 40(5%)-70(10%). Seed sown outdoors in November germ. 22%, partly in November and partly in February during a warm spell.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Sedum p. 213. 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.