This source reports two treatments. Both are shown.
Protocol 1
DerivedN. C. Deno, 1993- 1
Sow and cover
Temperature: 70°F 21°C · Light: dark
Two seedlings.
No stated waiting before sowing. Germination time not stated; 21 days assumed.
Deno gives absolute numbers here, not percentages: two seedlings.
Protocol 2
DerivedN. C. Deno, 1993- 1
Cold moist stratification
Temperature: 40°F 4°C
- 2
Warm moist stratification
Temperature: 70°F 21°C
One seedling.
No stated waiting before sowing. Germination time not stated; 21 days assumed.
Deno gives absolute numbers here, not percentages: one seedling.
This source doesn't state how long.