This source reports 5 treatments. All are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around March 26, 2027 for a May 3 last frost.
- 1
Sow on the surface — do not cover
Temperature: 70°F 21°C · Light: light
No stated waiting before sowing. Then 10 days to germinate.
90% germination in 8–10 days.
90% on the surface in light, and nothing else to do.
Protocol 2
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around March 21, 2027 for a May 3 last frost.
- 1
- 2
Sow and cover
Temperature: 70°F 21°C · Light: dark
No stated waiting before sowing. Then 15 days to germinate.
90% germination in 9–15 days.
GA-3 matches the light exactly -- the same 90%, a few days slower.
Protocol 3
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around December 30, 2026 for a May 3 last frost.
- 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
Sow on the surface — do not cover
Temperature: 70°F 21°C · Light: light
about 3 months from start to sowing. Then 6 days to germinate.
86% germination in 4–6 days.
A cold period halves the wait for four points. Still needs the light.
Protocol 4
DerivedN. C. Deno, 1993- 1
Sow and cover
Temperature: 70°F 21°C · Light: dark
Nothing.
No stated waiting before sowing.
0% germination.
Nothing in the dark without GA-3.
Protocol 5
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
Sow and cover
Temperature: 70°F 21°C · Light: dark
Nothing.
about 3 months from start to sowing.
0% germination.
Nothing in the dark after a cold period either. The cold is no substitute for the light.