About the plant
What it is and where it grows — not part of any germination protocol.
- Native range
- Japan, Southern Asia
Toxicity is noted only where a source states it. No note here is not a finding of safety.
Source: GBIF Backbone Taxonomy — Global Biodiversity Information Facility.
Two sources report 4 treatments between them. All are shown.
Protocol 1
DerivedN. C. Deno, 1998Difficulty 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 days · Temperature: 40°F 4°C
- 2
Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
about 6 months from start to sowing. Germination time not stated; 21 days assumed.
55% germination.
Protocol 2
DerivedN. C. Deno, 1993Difficulty High Rated by us, not by the source.
Start around March 22, 2027 for a May 3 last frost.
- 1
Sow and cover
Temperature: 70°F 21°C · Light: dark
No stated waiting before sowing. Then 14 days to germinate.
15% germination in 14 days.
Light made no difference and neither did a five-minute detergent wash.
Protocol 3
DerivedN. C. Deno, 1993Difficulty Very 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 days · Temperature: 40°F 4°C
- 2
Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C · Light: dark
about 6 months from start to sowing. Germination time not stated; 21 days assumed.
3% germination.
Protocol 4
DerivedN. C. Deno, 1993- 1
- 2
Sow and cover
Temperature: 70°F 21°C · Light: dark
No stated waiting before sowing.
0% germination.
The seeds rotted.