Campanula rotundifolia
Genus Campanula
This source reports two treatments. Both are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty Moderate Rated by us, not by the source.
Start around August 13, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on August 12, 2026.
- 1
Dry storage
Duration: 180 days · Temperature: 70°F 21°C
- 2
Sow and cover
Temperature: 70°F 21°C
about 6 months from start to sowing. Then 56 days to germinate.
65% germination in 7–56 days.
Protocol 2
DerivedN. C. Deno, 1993Difficulty High Rated by us, not by the source.
Start around June 19, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 18, 2026.
- 1
Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
4 germinated in this phase.
- 2
Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
32 germinated in this phase.
- 3
Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
about 9 months from start to sowing. Germination time not stated; 21 days assumed.
45% germination.