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Hydrangea hydrangeoides

Japanese Hydrangea Vine · Japanese-hydrangea · Climbing-hydrangea

Family HydrangeaceaeGenus Hydrangea

Broad white bracts ringing a cluster of small green buds, on a climbing shoot against a red wall
Flower阿橋 HQCC BY-SA 2.0

About the plant

What it is and where it grows — not part of any germination protocol.

The plant

Habit
Ground Cover, Perennial, VineExtension Gardener Plant Toolbox
Habit
lianaPlants of the World Online
Height
15-30 ft4.6-9.1 mExtension Gardener Plant Toolbox
Spread
8-10 ft2.4-3 mExtension Gardener Plant Toolbox
Flower
Cream/Tan, Green, Pink, WhiteExtension Gardener Plant Toolbox
Blooms
SummerExtension Gardener Plant Toolbox
Native range
Japan, Korea, Kuril Is.GBIF Backbone Taxonomy
Hardiness zones
5-8Extension Gardener Plant Toolbox

Growing conditions

Sun
Dappled Sunlight; Deep shade; Full sun; Partial ShadeExtension Gardener Plant Toolbox
Soil
High Organic MatterExtension Gardener Plant Toolbox
Soil pH
Acid (<6.0), Alkaline (>8.0), Neutral (6.0-8.0)Extension Gardener Plant Toolbox
Moisture
Good Drainage, MoistExtension Gardener Plant Toolbox

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Extension Gardener Plant Toolbox — NC State Extension; Plants of the World Online — Royal Botanic Gardens, Kew; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

  • Hydrangeoides means "like a hydrangea", which seems odd for a plant now in the genus Hydrangea. It was first described in the genus Schizophragma, and the name pointed to its likeness to what was then a separate genus. Wikipedia: Hydrangea hydrangeoides

This source reports 4 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Low Rated by us, not by the source.

Start around September 10, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 9, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 6 months from start to sowing. Then 28 days to germinate.

100% germination in 28 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Schizophragma p. 61Public domain
Show the original text
Schizophragma (Saxifragaceae). S. integrifolium DS 6 m germ. 70L(100% in 4th w), 70D(25% in'4-9 w), 40-70L(100% in 2-4 w), and 40-70D(50% in 6th w). The seeds are very small so that percent germinations are questionable. The somewhat positive effect of light is more evident in the faster rate of germination. Seeds DS 1 y were dead
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Schizophragma p. 61. 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, 1998

Difficulty Moderate Rated by us, not by the source.

Start around June 12, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 11, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

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

about 9 months from start to step 3. Germination happens during step 3, in 28 days.

100% germination in 14–28 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Schizophragma p. 61Public domain
Show the original text
Schizophragma (Saxifragaceae). S. integrifolium DS 6 m germ. 70L(100% in 4th w), 70D(25% in'4-9 w), 40-70L(100% in 2-4 w), and 40-70D(50% in 6th w). The seeds are very small so that percent germinations are questionable. The somewhat positive effect of light is more evident in the faster rate of germination. Seeds DS 1 y were dead
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Schizophragma p. 61. 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, 1998

Difficulty Moderate Rated by us, not by the source.

Start around May 29, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on May 28, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

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

about 9 months from start to step 3. Germination happens during step 3, in 42 days.

50% germination in 42 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Schizophragma p. 61Public domain
Show the original text
Schizophragma (Saxifragaceae). S. integrifolium DS 6 m germ. 70L(100% in 4th w), 70D(25% in'4-9 w), 40-70L(100% in 2-4 w), and 40-70D(50% in 6th w). The seeds are very small so that percent germinations are questionable. The somewhat positive effect of light is more evident in the faster rate of germination. Seeds DS 1 y were dead
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Schizophragma p. 61. 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, 1998

Difficulty High Rated by us, not by the source.

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

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 6 months from start to sowing. Then 63 days to germinate.

25% germination in 28–63 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Schizophragma p. 61Public domain
Show the original text
Schizophragma (Saxifragaceae). S. integrifolium DS 6 m germ. 70L(100% in 4th w), 70D(25% in'4-9 w), 40-70L(100% in 2-4 w), and 40-70D(50% in 6th w). The seeds are very small so that percent germinations are questionable. The somewhat positive effect of light is more evident in the faster rate of germination. Seeds DS 1 y were dead
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Schizophragma p. 61. 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.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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