Deno’s Garden

Clematis columbiana

Genus Clematis

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 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

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around May 1, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on April 30, 2026.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    8 germinated in this phase.

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  4. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    8 germinated in this phase.

Steps after step 3 run on after germination.

about 9 months from start to sowing. Then 70 days to germinate.

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

DerivedN. 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.