This source reports three treatments. All are shown.
Protocol 1
DerivedN. C. Deno, 1996Difficulty High Rated by us, not by the source.
Start around December 2, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 1, 2025.
- 1
Dry storage
Duration: 365 days · Temperature: 70°F 21°C
- 2
- 3
Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
- 4
Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
- 5
Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
Steps after step 3 run on after germination.
about 15 months from start to sowing. Then 35 days to germinate.
40% germination in 35 days.
Protocol 2
DerivedN. C. Deno, 1996Difficulty High Rated by us, not by the source.
Start around May 8, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on May 7, 2026.
- 1
Dry storage
Duration: 180 days · Temperature: 70°F 21°C
- 2
- 3
Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
- 4
Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
1 germinated in this phase.
- 5
Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C · Light: dark
3 germinated in this phase.
Steps after step 3 run on after germination.
about 9 months from start to sowing. Then 63 days to germinate.
35% germination in 21–63 days.
Protocol 3
DerivedN. C. Deno, 1996Difficulty Very high Rated by us, not by the source.
- 1
Dry storage
Duration: 180 days · Temperature: 70°F 21°C
- 2
Sow outdoors and leave it
about 6 months from start to sowing.
2% germination.
This source doesn't state how long.