Deno’s Garden

Crataegus phaenopyrum

Genus Crataegus

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around October 27, 2026 for a May 3 last frost.

  1. Clean the flesh off the seed

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  4. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  5. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

Steps after step 2 run on after germination.

about 3 months from start to sowing. Then 70 days to germinate.

51% germination in 28–70 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Crataegus p. 126Public domain
Show the original text
Crataegus (Rosaceae). C. phaenopyrum was collected in January and WC before sowing. Seeds germ. 70(6%)-40-70(50% in 4-8 d) and 40(51% in 4-10 w)-70-40-70 using fresh seed or seed DS 6 m at 70 or 40 or after DS 6 m at 70 in the dried fruit. GA-3 had no effect. An inhibitor system is being destroyed at 40, but a prior 3 m at 70 appears to inhibit this process.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Crataegus p. 126. 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.

Start around July 2, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 1, 2026.

  1. Clean the flesh off the seed

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    6 germinated in this phase.

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 9 months from start to sowing. Then 8 days to germinate.

50% germination in 4–8 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Crataegus p. 126Public domain
Show the original text
Crataegus (Rosaceae). C. phaenopyrum was collected in January and WC before sowing. Seeds germ. 70(6%)-40-70(50% in 4-8 d) and 40(51% in 4-10 w)-70-40-70 using fresh seed or seed DS 6 m at 70 or 40 or after DS 6 m at 70 in the dried fruit. GA-3 had no effect. An inhibitor system is being destroyed at 40, but a prior 3 m at 70 appears to inhibit this process.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Crataegus p. 126. 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.