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Dipsacus strigosus

Yellowflower Teasel

Family CaprifoliaceaeGenus Dipsacus

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

About the plant

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

Habit
biennial or perennialPlants of the World Online
Flower
CreamRead from the photograph on this page

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; Read from the photograph on this page — Deno's Garden.

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

  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 12 months from start to step 5. Germination happens during step 5, in 28 days.

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 January 4, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on January 3, 2026.

  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 15 months from start to step 3. Germination happens during step 3, in 2 days.

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.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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