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Campanula rotundifolia

Bluebell Bellflower · Common Harebell · Harebell

Family CampanulaceaeGenus Campanula

Three violet-blue bell flowers with pointed lobes, hanging from fine stalks down a wiry stem, against tall grass.
FlowerHans HillewaertCC BY-SA 3.0

About the plant

What it is and where it grows — not part of any germination protocol.

Habit
perennialPlants of the World Online
Habit
Perennial, Forb/herbPLANTS Database
Flower
Violet-blueWikipedia
Native range
Albania, Altay, Amur, Austria, Baltic States, Belarus and elsewhereGBIF Backbone Taxonomy

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; PLANTS Database — USDA NRCS; Wikipedia — Wikipedia contributors; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty 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

  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.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Campanula p. 110Public domain
Show the original text
Campanula (Campanulaceae). Most species are D-70 germinators. There are some that are 40-70 germinators and photorequirers and C. rotundifolia germ. 70(65% in 1-8w) for seed DS 6 m at 70 or 40 in contrast to 70(4%)-40(32%)-70(45%) for fresh seed. Seed sown at 40 failed to germinate.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Campanula p. 110. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    4 germinated in this phase.

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    32 germinated in this phase.

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 6 months from start to step 3. Germination happens during step 3; time not stated, 21 days assumed.

45% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Campanula p. 110Public domain
Show the original text
Campanula (Campanulaceae). Most species are D-70 germinators. There are some that are 40-70 germinators and photorequirers and C. rotundifolia germ. 70(65% in 1-8w) for seed DS 6 m at 70 or 40 in contrast to 70(4%)-40(32%)-70(45%) for fresh seed. Seed sown at 40 failed to germinate.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Campanula p. 110. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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