This source reports three treatments. All are shown.
Protocol 1
DerivedN. C. Deno, 1996Difficulty Low Rated by us, not by the source.
Start around February 1, 2027 for a May 3 last frost.
- 1
Cold moist stratification
Temperature: 40°F 4°C
No stated waiting before sowing. Then 63 days to germinate.
70% germination in 28–63 days.
This source doesn't state how long.
Protocol 2
DerivedN. C. Deno, 1996Difficulty Moderate Rated by us, not by the source.
- 1
Sow outdoors and leave it
Up in April.
No stated waiting before sowing.
65% germination.
This source doesn't state how long.
Protocol 3
DerivedN. C. Deno, 1996Difficulty Moderate Rated by us, not by the source.
Start around March 22, 2027 for a May 3 last frost.
- 1
- 2
Sow and cover
Temperature: 70°F 21°C
No stated waiting before sowing. Then 14 days to germinate.
43% germination in 14 days.