Deno’s GardenMy Garden

Physaria newberryi

Newberry Twinpod · Newberry's Twinpod

Family BrassicaceaeGenus Physaria

A low mound of small yellow four-petalled flowers packed over gray-green leaves, wedged against red sandstone.
FlowerArches National ParkPublic domain

About the plant

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

Habit
perennialPlants of the World Online
Habit
Perennial, Forb/herbPLANTS Database
Flower
YellowRead from the photograph on this page
Native range
Arizona, Nevada, New Mexico, UtahGBIF 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; Read from the photograph on this page — Deno's Garden; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around March 8, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 28 days to germinate.

50% germination in 7–28 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Physaria p. 193Public domain
Show the original text
Physaria (Brassicaceae). P. newberryi germ. 70(50% in 1-4 w) in either 70D or 70L and 40(40% in 4-11 w)-70(47% in 2-5 d)..
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Physaria p. 193. 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 Moderate Rated by us, not by the source.

Start around December 31, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    40 germinated in this phase.

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 3 months from start to step 2. Germination happens during step 2, in 5 days.

47% germination in 2–5 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Physaria p. 193Public domain
Show the original text
Physaria (Brassicaceae). P. newberryi germ. 70(50% in 1-4 w) in either 70D or 70L and 40(40% in 4-11 w)-70(47% in 2-5 d)..
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Physaria p. 193. 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

Add to My Garden

View species page