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 15, 2027 for a May 3 last frost.
- 1
Sow outdoors and leave it
Up in March and early April.
No stated waiting before sowing. Germination time not stated; 21 days assumed.
80% germination.
The best result in the entry, and it needs nothing but a seed bed.
This source doesn't state how long.
Protocol 2
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around March 28, 2027 for a May 3 last frost.
- 1
Sow and cover
Temperature: 70°F 21°C · Light: either
No stated waiting before sowing. Then 8 days to germinate.
60% germination in 3–8 days.
Light makes no difference: 60% either way, inside a week.
Protocol 3
DerivedN. C. Deno, 1993Difficulty Moderate Rated by us, not by the source.
Start around March 1, 2027 for a May 3 last frost.
- 1
Cold moist stratification
Temperature: 40°F 4°C
No stated waiting before sowing. Then 35 days to germinate.
26% germination in 35 days.
Cold costs more than half the packet and a month. There is no reason to use it.
This source doesn't state how long.