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Notothlaspi rosulatum

Penwiper

Family BrassicaceaeGenus Notothlaspi

A tight dome of white four-petalled flowers crowded over a flat rosette of gray-brown leaves, wedged among loose scree.
FlowernaturewatchwidowCC BY 4.0

About the plant

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

Habit
biennialPlants of the World Online
Flower
WhiteRead from the photograph on this page
Native range
New Zealand SouthGBIF 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; Read from the photograph on this page — Deno's Garden; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty High Rated by us, not by the source.

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  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

about 6 months from start to step 3. Germination happens during step 3; time not stated, 21 days assumed.

14% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Notothlaspi p. 61Public domain
Show the original text
Notothlaspi (Brassicaceae). N. rosulatum can be updated. Seeds germ. 70D(2!7 on 15th d)-40-70(1/7) and none in 40-70D.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Notothlaspi p. 61. 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

  1. Cold moist stratification

    Temperature: 40°F 4°C

Germination happens during step 1.

0% germination.

Nothing germinated at 40.

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

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Notothlaspi p. 61Public domain
Show the original text
Notothlaspi (Brassicaceae). N. rosulatum can be updated. Seeds germ. 70D(2!7 on 15th d)-40-70(1/7) and none in 40-70D.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Notothlaspi p. 61. 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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