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Cynanchum acutum

Stranglewort

Family ApocynaceaeGenus Cynanchum

A long slender green seed pod hanging among gray-green arrow-shaped leaves and clusters of small white flowers
FruitPhilmarinCC BY-SA 3.0

About the plant

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

Habit
climbing subshrub or shrubPlants of the World Online
Flower
Purplish, whiteFlora of Pakistan
Native range
Afghanistan, Albania, Algeria, Altay, Baleares, Bulgaria 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 Pakistan — S. I. Ali and M. Qaiser (eds.); GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Two sources report 4 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Low Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 14 days to germinate.

80% germination in 14 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Cynanchum p. 27Public domain
Show the original text
Cynanchum (Asciepediaceae). C. acutum germ. 70D(3/7 in 2nd w)-40- 70D(1/7 on 2nd d) and 70L(4/5 in 2nd w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Cynanchum p. 27. 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, 1998

Difficulty High Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: dark

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: dark

    1/7 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1, in 14 days.

43% germination in 14 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Cynanchum p. 27Public domain
Show the original text
Cynanchum (Asciepediaceae). C. acutum germ. 70D(3/7 in 2nd w)-40- 70D(1/7 on 2nd d) and 70L(4/5 in 2nd w).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Cynanchum p. 27. 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, 1996

Difficulty Low Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 14 days to germinate.

80% germination in 8–14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Cynanchum p. 35Public domain
Show the original text
Cynanchum (Asclepediaceae). C. acutum germ. 70D(3/7 in 2nd w) and 70L(4/5 in 8-14 d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Cynanchum p. 35. 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 4

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 14 days to germinate.

43% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Cynanchum p. 35Public domain
Show the original text
Cynanchum (Asclepediaceae). C. acutum germ. 70D(3/7 in 2nd w) and 70L(4/5 in 8-14 d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Cynanchum p. 35. 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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