This source reports two treatments. Both are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty High Rated by us, not by the source.
Start around February 22, 2027 for a May 3 last frost.
- 1
Sow and cover
Temperature: 70°F 21°C · Light: either
No stated waiting before sowing. Then 42 days to germinate.
20% germination in 28–42 days.
20% either way -- unlike the cranberry, this one does not care about light.
Protocol 2
DerivedN. C. Deno, 1993- 1
Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
Deno gives no length for this period; three months is his standard cycle.
- 2
Warm moist stratification
Temperature: 70°F 21°C
Nothing.
about 3 months from start to sowing.
0% germination.
Nothing after a cold period. Do not chill this one.
This source doesn't state how long.