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Linanthus watsonii

Watson's Prickly Phlox

Family PolemoniaceaeGenus Linanthus

Stiff needle-like gray-green leaves set in whorls along a slender woody stem
LeafLynn MoorePublic 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
White, yellowishWikipedia
Native range
Arizona, Colorado, Idaho, Nevada, Utah, WyomingGBIF 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; Wikipedia — Wikipedia contributors; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 14 days to germinate.

50% germination in 14 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Leptodactylon p. 52Public domain
Show the original text
Leptodactylon (Polemoniaceae). L. watsonii germ. 70D(4/8 in 2nd w) and 40(4/10 in 8-10 w)-70D(4/10 on 2nd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Leptodactylon p. 52. 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 Moderate Rated by us, not by the source.

Start around January 25, 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 Light: dark

    4/10 germinated in this phase.

Steps after step 1 run on after germination.

Germination happens during step 1, in 70 days.

40% germination in 56–70 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Leptodactylon p. 52Public domain
Show the original text
Leptodactylon (Polemoniaceae). L. watsonii germ. 70D(4/8 in 2nd w) and 40(4/10 in 8-10 w)-70D(4/10 on 2nd d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Leptodactylon p. 52. 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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