Deno’s Garden

Pterostyrax hispidus

Genus Pterostyrax

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 1, 2027 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 35 days to germinate.

33% germination in 35 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Pterostyrax p. 69Public domain
Show the original text
Pterostyrax (Styracaceae). P. hispidus germ. 70 GA-3(2/6 in 5th w), 70L(1/6 in 4th w), 70D-40-70D-40-70D-40(none), and 40-70D-40-70D-40-70D( 1 /6 on 7th d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pterostyrax p. 69. 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 High 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.

17% germination in 28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Pterostyrax p. 69Public domain
Show the original text
Pterostyrax (Styracaceae). P. hispidus germ. 70 GA-3(2/6 in 5th w), 70L(1/6 in 4th w), 70D-40-70D-40-70D-40(none), and 40-70D-40-70D-40-70D( 1 /6 on 7th d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pterostyrax p. 69. 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 High Rated by us, not by the source.

Start around October 6, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 5, 2025.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

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

  5. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  6. Warm moist stratification

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

about 18 months from start to sowing. Then 7 days to germinate.

17% germination in 7 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Pterostyrax p. 69Public domain
Show the original text
Pterostyrax (Styracaceae). P. hispidus germ. 70 GA-3(2/6 in 5th w), 70L(1/6 in 4th w), 70D-40-70D-40-70D-40(none), and 40-70D-40-70D-40-70D( 1 /6 on 7th d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Pterostyrax p. 69. 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.