Deno’s Garden

Hydrangea arborescens

Genus Hydrangea

This source reports 5 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low 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. Then 21 days to germinate.

100% germination in 7–21 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. arborescens germ. 70L(100% in 1-3 w), 70 GA-3(100% in 2nd w) 70D(none), 40-70L(100% in 3rd w), 40-70D(12% in 3rd w), and 2% in May in OT
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 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. arborescens germ. 70L(100% in 1-3 w), 70 GA-3(100% in 2nd w) 70D(none), 40-70L(100% in 3rd w), 40-70D(12% in 3rd w), and 2% in May in OT
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 Low Rated by us, not by the source.

Start around March 22, 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 14 days to germinate.

100% 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. arborescens germ. 70L(100% in 1-3 w), 70 GA-3(100% in 2nd w) 70D(none), 40-70L(100% in 3rd w), 40-70D(12% in 3rd w), and 2% in May in OT
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 4

DerivedN. C. Deno, 1996

Difficulty High 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: dark

about 6 months from start to sowing. Then 21 days to germinate.

12% 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. arborescens germ. 70L(100% in 1-3 w), 70 GA-3(100% in 2nd w) 70D(none), 40-70L(100% in 3rd w), 40-70D(12% in 3rd w), and 2% in May in OT
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 5

DerivedN. C. Deno, 1996

Difficulty Very high Rated by us, not by the source.

  1. Sow outdoors and leave it

    Up in May.

No stated waiting before sowing.

2% germination.

This source doesn't state how long.

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. arborescens germ. 70L(100% in 1-3 w), 70 GA-3(100% in 2nd w) 70D(none), 40-70L(100% in 3rd w), 40-70D(12% in 3rd w), and 2% in May in OT
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.