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Corylopsis spicata

Spike Winter Hazel

Family HamamelidaceaeGenus Corylopsis

Nodding tassels of yellow-green flowers opening from red-brown bud scales on bare branches
FlowerKENPEICC BY-SA 3.0

About the plant

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

The plant

Habit
ShrubExtension Gardener Plant Toolbox
Habit
shrubPlants of the World Online
Height
6-8 ft1.8-2.4 mExtension Gardener Plant Toolbox
Spread
6-10 ft1.8-3 mExtension Gardener Plant Toolbox
Flower
Gold/YellowExtension Gardener Plant Toolbox
Blooms
Spring, WinterExtension Gardener Plant Toolbox
Native range
JapanGBIF Backbone Taxonomy
Hardiness zones
5-8Extension Gardener Plant Toolbox

Growing conditions

Sun
Full sun; Partial ShadeExtension Gardener Plant Toolbox
Soil
High Organic Matter, Loam (Silt), SandExtension Gardener Plant Toolbox
Soil pH
Acid (<6.0)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.

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 March 22, 2027 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 14 days to germinate.

18% germination in 14 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Corylopsis p. 125Public domain
Show the original text
Corylopsis (Hamamelldaceae). C. spicata germ. best after DS for 6 m, removing the husks, and placing outdoors. These germ. 15% in June when placed outdoors in mid-May. These seeds also germ. 40(5%)-70, 70D GA-3(18% in 2nd w), and 70D(none). It is not known whether removal of the husks is a factor because it was extremely difficult to remove these husks in fresh seed. The GA-3 seedlings were badly etiolated.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Corylopsis p. 125. 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 Very high Rated by us, not by the source.

Start around March 15, 2027 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

Steps after step 1 run on after germination.

Germination happens during step 1; time not stated, 21 days assumed.

5% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Corylopsis p. 125Public domain
Show the original text
Corylopsis (Hamamelldaceae). C. spicata germ. best after DS for 6 m, removing the husks, and placing outdoors. These germ. 15% in June when placed outdoors in mid-May. These seeds also germ. 40(5%)-70, 70D GA-3(18% in 2nd w), and 70D(none). It is not known whether removal of the husks is a factor because it was extremely difficult to remove these husks in fresh seed. The GA-3 seedlings were badly etiolated.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Corylopsis p. 125. 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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