IllustrationSmithsonian Institution, NMNH BotanyCC0This source reports two treatments. Both are shown.
Protocol 1
DerivedN. C. Deno, 1996Difficulty High Rated by us, not by the source.
Start around February 22, 2027 for a May 3 last frost.
- 1
Cold moist stratification
Temperature: 40°F 4°C
No stated waiting before sowing. Then 42 days to germinate.
14% germination in 42 days.
This source doesn't state how long.
Protocol 2
DerivedN. C. Deno, 1996- 1
Sow and cover
Temperature: 70°F 21°C · Light: dark
No stated waiting before sowing.
0% germination.
Nothing germinated at 70.
How each step is done, in Deno’s words, and what Verified and Derived mean.