Deno’s Garden

Spiraea betulifolia

Genus Spiraea

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around March 8, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 28 days to germinate.

100% germination in 7–28 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Spiraea p. 217Public domain
Show the original text
Spiraea (Rosaceae). Some required light. S. betulifolia requires light for germination.. Fresh seed or seed DS 6 m at 70 germ. 70L(100% in 1-4 w), 70D(1%), 40-70L(100% in 1-4 w), and 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Spiraea p. 217. 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 Moderate 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

  2. Warm moist stratification

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

about 6 months from start to sowing. Then 28 days to germinate.

100% germination in 7–28 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Spiraea p. 217Public domain
Show the original text
Spiraea (Rosaceae). Some required light. S. betulifolia requires light for germination.. Fresh seed or seed DS 6 m at 70 germ. 70L(100% in 1-4 w), 70D(1%), 40-70L(100% in 1-4 w), and 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Spiraea p. 217. 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 Very high Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

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

1% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Spiraea p. 217Public domain
Show the original text
Spiraea (Rosaceae). Some required light. S. betulifolia requires light for germination.. Fresh seed or seed DS 6 m at 70 germ. 70L(100% in 1-4 w), 70D(1%), 40-70L(100% in 1-4 w), and 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Spiraea p. 217. 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.