Deno’s Garden

Arbutus menziesii

Genus Arbutus

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

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

  1. Cold moist stratification

    Temperature: 40°F 4°C

No stated waiting before sowing. Then 56 days to germinate.

98% germination in 56 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Arbutus p. 21Public domain
Show the original text
Arbutus (Ericaceae). A. menziesii germ. 40(98% in 8th w). A prior 3 m in 70D or 70L and DS for 6 m or 1 y had little effect. Seeds germ. 70 GA-3(45% in 3-11 . w)-40(55% in 3-6 w), but this is of no advantage in view of the excellent germination at 40. Seeds DS 2 y germ. 40(78% in 11th w) indicating some minor deterioration.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Arbutus p. 21. 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 Low Rated by us, not by the source.

Start around January 19, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on January 18, 2025.

  1. Dry storage

    Duration: 730 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Temperature: 40°F 4°C

about 2 years from start to sowing. Then 77 days to germinate.

78% germination in 77 days.

This source doesn't state how long.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Arbutus p. 21Public domain
Show the original text
Arbutus (Ericaceae). A. menziesii germ. 40(98% in 8th w). A prior 3 m in 70D or 70L and DS for 6 m or 1 y had little effect. Seeds germ. 70 GA-3(45% in 3-11 . w)-40(55% in 3-6 w), but this is of no advantage in view of the excellent germination at 40. Seeds DS 2 y germ. 40(78% in 11th w) indicating some minor deterioration.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Arbutus p. 21. 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 Moderate Rated by us, not by the source.

Start around August 27, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 26, 2026.

  1. Gibberellic acid soak

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    45 germinated in this phase.

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

about 6 months from start to sowing. Then 42 days to germinate.

55% germination in 21–42 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Arbutus p. 21Public domain
Show the original text
Arbutus (Ericaceae). A. menziesii germ. 40(98% in 8th w). A prior 3 m in 70D or 70L and DS for 6 m or 1 y had little effect. Seeds germ. 70 GA-3(45% in 3-11 . w)-40(55% in 3-6 w), but this is of no advantage in view of the excellent germination at 40. Seeds DS 2 y germ. 40(78% in 11th w) indicating some minor deterioration.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Arbutus p. 21. 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.