This source reports three treatments. All are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around March 30, 2027 for a May 3 last frost.
- 1
Sow and cover
Temperature: 70°F 21°C · Light: either
No stated waiting before sowing. Then 6 days to germinate.
30% germination in 1–6 days.
30% inside a week. Light makes no difference.
Protocol 2
DerivedN. C. Deno, 1993Difficulty Moderate Rated by us, not by the source.
Start around March 15, 2027 for a May 3 last frost.
- 1
Sow outdoors and leave it
No stated waiting before sowing. Germination time not stated; 21 days assumed.
21% germination.
Two thirds of the warm result, for none of the work.
This source doesn't state how long.
Protocol 3
DerivedN. C. Deno, 1993Difficulty High Rated by us, not by the source.
Start around March 26, 2027 for a May 3 last frost.
- 1
Cold moist stratification
Temperature: 40°F 4°C
7%, over 3-8 weeks.
- 2
Warm moist stratification
Temperature: 70°F 21°C
A further 8%, in 2-10 days.
No stated waiting before sowing. Then 10 days to germinate.
8% germination in 2–10 days.
Cold costs this one most of the packet.
This source doesn't state how long.