The whole plantДимитър Найденов / Dimìtar NàydenovCC BY-SA 4.0About the plant
What it is and where it grows — not part of any germination protocol.
The plant
- Habit
- Shrub, TreeExtension Gardener Plant Toolbox
- Habit
- treePlants of the World Online
- Height
- 15-30 ft4.6-9.1 mExtension Gardener Plant Toolbox
- Spread
- 15-26 ft4.6-7.9 mExtension Gardener Plant Toolbox
- Flower
- Green, WhiteExtension Gardener Plant Toolbox
- Blooms
- SpringExtension Gardener Plant Toolbox
- Native range
- Afghanistan, Albania, Altay, Amur, Austria, Bulgaria and elsewhereGBIF Backbone Taxonomy
- Hardiness zones
- 3-8Extension Gardener Plant Toolbox
Growing conditions
- Sun
- Full sun; Partial ShadeExtension Gardener Plant Toolbox
- Soil
- High Organic MatterExtension Gardener Plant Toolbox
- Soil pH
- 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.
This source reports 5 treatments. All are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
- 1
Sow outdoors and leave it
Up in March.
No stated waiting before sowing.
94% germination.
This source doesn't state how long step 1 lasts.
Protocol 2
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around January 25, 2027 for a May 3 last frost.
- 1
Cold moist stratification
Temperature: 40°F 4°C
Germination happens during step 1, in 70 days.
75% germination in 56–70 days.
Protocol 3
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around January 25, 2027 for a May 3 last frost.
- 1
Cold moist stratification
Temperature: 40°F 4°C
Germination happens during step 1, in 70 days.
75% germination in 56–70 days.
Protocol 4
DerivedN. C. Deno, 1993Difficulty Moderate Rated by us, not by the source.
Start around July 16, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 15, 2026.
- 1
Dry storage
Duration: 180 days · Temperature: 70°F 21°C
- 2
Cold moist stratification
Temperature: 40°F 4°C
about 6 months from start to step 2. Germination happens during step 2, in 84 days.
47% germination in 21–84 days.
Protocol 5
DerivedN. C. Deno, 1993Difficulty Very high Rated by us, not by the source.
Start around September 24, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 23, 2026.
- 1
Dry storage
Duration: 180 days · Temperature: 70°F 21°C
- 2
Sow and cover
Temperature: 70°F 21°C
about 6 months from start to sowing. Then 14 days to germinate.
3% germination in 14 days.
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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