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Eriastrum densifolium

Giant Woollystar

Family PolemoniaceaeGenus Eriastrum

Pale violet star-shaped flowers striped darker, among stiff spiny bracts on sand
FlowerAnthony Valois and the National Park ServicePublic domain

About the plant

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

Habit
subshrubPlants of the World Online
Habit
Perennial, Forb/herb, SubshrubPLANTS Database
Flower
VioletRead from the photograph on this page
Native range
California, Mexico NorthwestGBIF 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 three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 31, 2027 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 5 days to germinate.

100% germination in 3–5 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Eriastrum p. 42Public domain
Show the original text
Eriastrum (Poiemoniaceae). E. densifolium v. austromontanum germ. 70 GA-3(100% in 3-5 d), 70L(20%), and 70D(83% in 5-11 d) using fresh seeds. Like all D-70 germinators there is an optimum length of DS which is a compromise between time for destruction of the blocking mechanism and dying of the seeds. This is evident in this species both in the percent germination and rate of germination. Germination in 70D for seeds DS 3 m, 6 m, 1 y, and 2 y were 83% in 5-11 d, 100% on 2nd d, 19% in 4-19 d, and all dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Eriastrum p. 42. 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 Low Rated by us, not by the source.

Start around March 25, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 11 days to germinate.

83% germination in 5–11 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Eriastrum p. 42Public domain
Show the original text
Eriastrum (Poiemoniaceae). E. densifolium v. austromontanum germ. 70 GA-3(100% in 3-5 d), 70L(20%), and 70D(83% in 5-11 d) using fresh seeds. Like all D-70 germinators there is an optimum length of DS which is a compromise between time for destruction of the blocking mechanism and dying of the seeds. This is evident in this species both in the percent germination and rate of germination. Germination in 70D for seeds DS 3 m, 6 m, 1 y, and 2 y were 83% in 5-11 d, 100% on 2nd d, 19% in 4-19 d, and all dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Eriastrum p. 42. 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

Difficulty High Rated by us, not by the source.

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

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Germination time not stated; 21 days assumed.

20% germination.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Eriastrum p. 42Public domain
Show the original text
Eriastrum (Poiemoniaceae). E. densifolium v. austromontanum germ. 70 GA-3(100% in 3-5 d), 70L(20%), and 70D(83% in 5-11 d) using fresh seeds. Like all D-70 germinators there is an optimum length of DS which is a compromise between time for destruction of the blocking mechanism and dying of the seeds. This is evident in this species both in the percent germination and rate of germination. Germination in 70D for seeds DS 3 m, 6 m, 1 y, and 2 y were 83% in 5-11 d, 100% on 2nd d, 19% in 4-19 d, and all dead.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Eriastrum p. 42. 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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