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Argemone pleiacantha

Southwestern Prickly Poppy · Southwestern Pricklypoppy

Family PapaveraceaeGenus Argemone

A single large white poppy with crumpled petals and a dense yellow boss of stamens, among spiny gray-green foliage
FlowerPetrified Forest Ranger (Hallie Larsen/NPS)CC BY 2.0

About the plant

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

Habit
annual or perennialPlants of the World Online
Habit
Perennial, Forb/herbPLANTS Database
Flower
WhiteFlora of North America
Native range
Arizona, Mexico Northeast, Mexico Northwest, New MexicoGBIF 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; PLANTS Database — USDA NRCS; Flora of North America — Flora of North America Editorial Committee; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

  1. Sow outdoors and leave it

    Up in April.

No stated waiting before sowing.

80% germination.

This source doesn't state how long step 1 lasts.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Argemone p. 100Public domain
Show the original text
Argemone (Papaveraceae). A. pleicantha germ. 40(8% in 7th w)-70(2%), 70-40(none), and 80% in April in outdoor treatment. This shows that the oscillating temperatures of outdoor treatment are required for germination.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Argemone p. 100. 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 Very high Rated by us, not by the source.

Start around February 15, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

    2 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1, in 49 days.

8% germination in 49 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Argemone p. 100Public domain
Show the original text
Argemone (Papaveraceae). A. pleicantha germ. 40(8% in 7th w)-70(2%), 70-40(none), and 80% in April in outdoor treatment. This shows that the oscillating temperatures of outdoor treatment are required for germination.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Argemone p. 100. 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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