Incarvillea arguta
Family BignoniaceaeGenus Incarvillea
Also published as Incarvillea diffusa. You are in the right place.
This source reports two treatments. Both are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around March 27, 2027 for a May 3 last frost.
- 1
Sow and cover
Temperature: 70°F 21°C · Light: either
No stated waiting before sowing. Then 9 days to germinate.
100% germination in 6–9 days.
Light made no difference: 100% either way.
Protocol 2
DerivedN. C. Deno, 1993Difficulty Low Rated by us, not by the source.
Start around March 30, 2027 for a May 3 last frost.
- 1
Cold moist stratification
Temperature: 40°F 4°C
- 2
Warm moist stratification
Temperature: 70°F 21°C
92% germinated after the move, in 2-6 days.
No stated waiting before sowing. Then 6 days to germinate.
92% germination in 2–6 days.
Faster after the move, but it gives up eight percent to do it.
This source doesn't state how long.
How each step is done, in Deno’s words, and what Verified and Derived mean.
