Deno’s Garden

Sphaeralcea ambigua

Genus Sphaeralcea

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty High Rated by us, not by the source.

Start around May 29, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on May 28, 2026.

  1. Dry storage

    Duration: 180 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

    20 germinated in this phase.

Steps after step 2 run on after germination.

about 9 months from start to sowing. Then 42 days to germinate.

20% germination in 42 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Sphaeralcea p. 62Public domain
Show the original text
Sphaeralcea (Malvaceae). S. ambigua DS 6 m germ. 70D(12% in 1-5 w), 70L(16% in 2nd w), and 40(20% in 6th w)-70D(20% on 2nd d). '
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Sphaeralcea p. 62. 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 High Rated by us, not by the source.

Start around September 23, 2026 for a May 3 last frost.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 6 months from start to sowing. Then 14 days to germinate.

16% germination in 14 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Sphaeralcea p. 62Public domain
Show the original text
Sphaeralcea (Malvaceae). S. ambigua DS 6 m germ. 70D(12% in 1-5 w), 70L(16% in 2nd w), and 40(20% in 6th w)-70D(20% on 2nd d). '
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Sphaeralcea p. 62. 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 September 3, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 2, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 6 months from start to sowing. Then 35 days to germinate.

12% germination in 7–35 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Sphaeralcea p. 62Public domain
Show the original text
Sphaeralcea (Malvaceae). S. ambigua DS 6 m germ. 70D(12% in 1-5 w), 70L(16% in 2nd w), and 40(20% in 6th w)-70D(20% on 2nd d). '
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Sphaeralcea p. 62. 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.