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About the plant What it is and where it grows — not part of any germination protocol.
Habit climber Plants of the World Online
Habit Perennial, Vine PLANTS Database
Flower Violet-blue Flora of North America
Native range Native to the lower 48 states PLANTS Database 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; Flora of North America — Flora of North America Editorial Committee.
Worth knowing Columbiana refers to the Columbia River. It is sometimes called blue clematis, though its color is closer to purple or mauve. Wikipedia: Clematis columbiana This source reports three treatments. All are shown.
Protocol 1 N. C. Deno, 1993 Difficulty Moderate Rated by us, not by the source.
Start around January 25, 2027 for a May 3 last frost.
1 Sow and cover
Temperature: 70°F 21°C · Light: light
No stated waiting before sowing. Then 70 days to germinate.
50% germination in 14–70 days.
Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Clematis p. 119Public domain Show the original text Clematis (Ranunculaceae). Light and/or GA-3 are required for the germination of some species. Although a number of species germ. significantly in the dark, light and GA-3 needs to be tried on all species. Multicycle patterns were common and some species germ. largely at 40. The seeds of all species are designed to be dispersed by wind so that it was presumed that DS would be tolerated. This was supported by the data for seeds DS 6 m, however seeds of C. columbiana required light for germination and germ. 70L(50% in 2-10 w) and none in 70D, 40-70L, or 40-70D using either fresh seed or seed DS 6 m at 70. An initial 4 w in 70D had no effect on the germination in 70L. Seeds treated with GA-3 rotted in a month. A sample from a year earlier germ. 40-70(8% in 6th w)-40(46% in 6- 10 w)-70(8% in 2 d) and 4% after three cycles when started at 70. Seed Germination Theory and Practice, 2nd ed., Ch. 20, Clematis p. 119. 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 N. C. Deno, 1993 Difficulty High Rated by us, not by the source.
Start around July 30, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on July 29, 2026.
1 Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
2 Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
8 germinated in this phase.
3 Cold moist stratification
Duration: 90 days · Temperature: 40°F 4°C
4 Warm moist stratification
Duration: 90 days · Temperature: 70°F 21°C
8 germinated in this phase.
Steps after step 3 run on after germination.
about 6 months from start to step 3. Germination happens during step 3, in 70 days.
46% germination in 42–70 days.
Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Clematis p. 119Public domain Show the original text Clematis (Ranunculaceae). Light and/or GA-3 are required for the germination of some species. Although a number of species germ. significantly in the dark, light and GA-3 needs to be tried on all species. Multicycle patterns were common and some species germ. largely at 40. The seeds of all species are designed to be dispersed by wind so that it was presumed that DS would be tolerated. This was supported by the data for seeds DS 6 m, however seeds of C. columbiana required light for germination and germ. 70L(50% in 2-10 w) and none in 70D, 40-70L, or 40-70D using either fresh seed or seed DS 6 m at 70. An initial 4 w in 70D had no effect on the germination in 70L. Seeds treated with GA-3 rotted in a month. A sample from a year earlier germ. 40-70(8% in 6th w)-40(46% in 6- 10 w)-70(8% in 2 d) and 4% after three cycles when started at 70. Seed Germination Theory and Practice, 2nd ed., Ch. 20, Clematis p. 119. 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 N. C. Deno, 1993 1 Sow and cover
Temperature: 70°F 21°C · Light: dark
No stated waiting before sowing.
0% germination.
Nothing germinated at 70.
Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Clematis p. 119Public domain Show the original text Clematis (Ranunculaceae). Light and/or GA-3 are required for the germination of some species. Although a number of species germ. significantly in the dark, light and GA-3 needs to be tried on all species. Multicycle patterns were common and some species germ. largely at 40. The seeds of all species are designed to be dispersed by wind so that it was presumed that DS would be tolerated. This was supported by the data for seeds DS 6 m, however seeds of C. columbiana required light for germination and germ. 70L(50% in 2-10 w) and none in 70D, 40-70L, or 40-70D using either fresh seed or seed DS 6 m at 70. An initial 4 w in 70D had no effect on the germination in 70L. Seeds treated with GA-3 rotted in a month. A sample from a year earlier germ. 40-70(8% in 6th w)-40(46% in 6- 10 w)-70(8% in 2 d) and 4% after three cycles when started at 70. Seed Germination Theory and Practice, 2nd ed., Ch. 20, Clematis p. 119. Quoted exactly. Every value on this card comes from this record; 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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