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Phacelia campanularia

California Bluebell · Desert Bluebells · Desert Phacelia · Desertbells

Family BoraginaceaeGenus Phacelia

A deep gentian-blue bell flower opening flat, with five white club-shaped anthers on dark filaments at its center.
FlowerStickpenPublic domain

About the plant

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

Habit
annualPlants of the World Online
Habit
Annual, Forb/herbPLANTS Database
Flower
Bright blueWikipedia
Native range
Arizona, CaliforniaGBIF 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.

Worth knowing

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

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

  1. Cold moist stratification

    Temperature: 40°F 4°C

Germination happens during step 1, in 28 days.

79% germination in 7–28 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Phacelia p. 191Public domain
Show the original text
Phacelia (Hydrophyllaceae). P. campanularia germ. 70(50% in 1-8 d) and 40(79% in 1-4 w). Seed DS 3 y was dead.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Phacelia p. 191. 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 March 28, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 8 days to germinate.

50% germination in 1–8 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Phacelia p. 191Public domain
Show the original text
Phacelia (Hydrophyllaceae). P. campanularia germ. 70(50% in 1-8 d) and 40(79% in 1-4 w). Seed DS 3 y was dead.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Phacelia p. 191. 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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