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Dipsacus strigosus

Genus Dipsacus

A rounded head of cream florets ringed by long dark curving spines, on a bristly stem
FlowerFranz XaverCC BY-SA 3.0

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty High Rated by us, not by the source.

Start around December 14, 2026 for a May 3 last frost. Too late for spring 2027 — that needed starting on December 13, 2025.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

  2. Warm moist stratification

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

  3. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

  4. Warm moist stratification

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

  5. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

  6. Warm moist stratification

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

    16 germinated in this phase.

Steps after step 5 run on after germination.

about 15 months from start to sowing. Then 28 days to germinate.

38% germination in 28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Dipsacus p. 39Public domain
Show the original text
Dipsacus (Dipsacaceae). S. strigosus germ. 40-70-40-70-40(38% in 4th w)-70(16% in 2-4 d) and none in 70D, OS, and OT over two years. Light had no effect. Seeds DS 1 y germ. 40(6%)- 70D(24% on 2nd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Dipsacus p. 39. 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, 1996

Difficulty High Rated by us, not by the source.

Start around October 6, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 5, 2025.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C Light: either

    6 germinated in this phase.

  3. Warm moist stratification

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

about 1.5 years from start to sowing. Then 2 days to germinate.

24% germination in 2 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Dipsacus p. 39Public domain
Show the original text
Dipsacus (Dipsacaceae). S. strigosus germ. 40-70-40-70-40(38% in 4th w)-70(16% in 2-4 d) and none in 70D, OS, and OT over two years. Light had no effect. Seeds DS 1 y germ. 40(6%)- 70D(24% on 2nd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Dipsacus p. 39. 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

  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, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Dipsacus p. 39Public domain
Show the original text
Dipsacus (Dipsacaceae). S. strigosus germ. 40-70-40-70-40(38% in 4th w)-70(16% in 2-4 d) and none in 70D, OS, and OT over two years. Light had no effect. Seeds DS 1 y germ. 40(6%)- 70D(24% on 2nd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Dipsacus p. 39. 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.

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