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Campanula alliariifolia

Cornish Bellflower

Family CampanulaceaeGenus Campanula

White bell flowers hanging in a row along an arching pink stem, above soft heart-shaped leaves
FlowerKurt Stüber [1]CC 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
Forb/herbPLANTS Database
Flower
Light violet, whiteOrnamental Plants From Russia And Adjacent States Of The Former Soviet Union
Native range
North Caucasus, Transcaucasus, TürkiyeGBIF 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; Ornamental Plants From Russia And Adjacent States Of The Former Soviet Union; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

  • Despite the name Cornish bellflower, this vigorous perennial comes from the Caucasus and Turkey. It has gray, hairy, heart-shaped leaves and tubular white bells. Wikipedia: Campanula alliariifolia

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around October 3, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 2, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    2 germinated in this phase.

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 6 months from start to step 3. Germination happens during step 3, in 5 days.

98% germination in 3–5 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. alliarifolia is primarily a 40-70 germinator as shown by 40-70(70% in 3-17 d) for seed DS 6 m at 70 and 40-70(40% in 5-15 d) for fresh seed. A curious divergence appeared in the 70-40-70 treatment. Fresh seed germ. 70(2%)-40-70(98% in 3-5 d) whereas the DS seed germ. none
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 Moderate Rated by us, not by the source.

Start around June 23, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on June 22, 2026.

  1. Dry storage

    Duration: 180 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 9 months from start to step 3. Germination happens during step 3, in 17 days.

70% germination in 3–17 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. alliarifolia is primarily a 40-70 germinator as shown by 40-70(70% in 3-17 d) for seed DS 6 m at 70 and 40-70(40% in 5-15 d) for fresh seed. A curious divergence appeared in the 70-40-70 treatment. Fresh seed germ. 70(2%)-40-70(98% in 3-5 d) whereas the DS seed germ. none
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 3

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around December 21, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 3 months from start to step 2. Germination happens during step 2, in 15 days.

40% germination in 5–15 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. alliarifolia is primarily a 40-70 germinator as shown by 40-70(70% in 3-17 d) for seed DS 6 m at 70 and 40-70(40% in 5-15 d) for fresh seed. A curious divergence appeared in the 70-40-70 treatment. Fresh seed germ. 70(2%)-40-70(98% in 3-5 d) whereas the DS seed germ. none
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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