Deno’s Garden

Hydrangea paniculata

Genus Hydrangea

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 September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 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 21 days to germinate.

100% germination in 21 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Hydrangea p. 49Public domain
Show the original text
Hydrangea (Saxifragaceae). The seeds of both species were received in March and had 6 m of DS. H. panniculata germ. 70L(2%), 70 GA-3{100% in 2nd w), 70D(none), 40- 70L(100% in 3rd w), and 40-70D(4% in 2nd w). Seeds were dead after 1 y DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Hydrangea p. 49. 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 Very high Rated by us, not by the source.

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

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

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

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

4% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Hydrangea p. 49Public domain
Show the original text
Hydrangea (Saxifragaceae). The seeds of both species were received in March and had 6 m of DS. H. panniculata germ. 70L(2%), 70 GA-3{100% in 2nd w), 70D(none), 40- 70L(100% in 3rd w), and 40-70D(4% in 2nd w). Seeds were dead after 1 y DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Hydrangea p. 49. 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 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: light

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

2% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Hydrangea p. 49Public domain
Show the original text
Hydrangea (Saxifragaceae). The seeds of both species were received in March and had 6 m of DS. H. panniculata germ. 70L(2%), 70 GA-3{100% in 2nd w), 70D(none), 40- 70L(100% in 3rd w), and 40-70D(4% in 2nd w). Seeds were dead after 1 y DS.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Hydrangea p. 49. 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.