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Codonopsis clematidea

Bonnet-bellflower

Family CampanulaceaeGenus Codonopsis

Pale blue-white bell flowers nodding on wiry stems above small leaves, in grass
FlowerAgnieszka Kwiecień, NovaCC BY-SA 4.0

About the plant

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

Habit
tuberous geophytePlants of the World Online
Flower
Pale blueFlora of China
Native range
Afghanistan, Kazakhstan, Kirgizstan, Mongolia, Pakistan, Tadzhikistan 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; Flora of China — Wu Zhengyi, Peter H. Raven and Hong Deyuan (eds.); GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

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 March 15, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 21 days to germinate.

50% germination in 21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Codonopsis p. 121Public domain
Show the original text
Codonopsis (Campanulaceae). C. clematidea germ. 70(50-60% in 3rd w) using two samples of commercial seed. However, wild collected seed germ. 70(3%)-40-70 and 40(48%)-70(6%). It is probable that the commercial seed and the wild collected seed were different species.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Codonopsis p. 121. 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 March 15, 2027 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

    6 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1; time not stated, 21 days assumed.

48% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Codonopsis p. 121Public domain
Show the original text
Codonopsis (Campanulaceae). C. clematidea germ. 70(50-60% in 3rd w) using two samples of commercial seed. However, wild collected seed germ. 70(3%)-40-70 and 40(48%)-70(6%). It is probable that the commercial seed and the wild collected seed were different species.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Codonopsis p. 121. 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 Very high Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Warm moist stratification

    Duration: 90 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

Steps after step 1 run on after germination.

Germination happens during step 1; time not stated, 21 days assumed.

3% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Codonopsis p. 121Public domain
Show the original text
Codonopsis (Campanulaceae). C. clematidea germ. 70(50-60% in 3rd w) using two samples of commercial seed. However, wild collected seed germ. 70(3%)-40-70 and 40(48%)-70(6%). It is probable that the commercial seed and the wild collected seed were different species.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Codonopsis p. 121. 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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