Deno’s GardenMy Garden

Campanula shetleri

Castle Crag Harebell · Castle Crags Bellflower · Castle Crags Harebell

Family CampanulaceaeGenus Campanula

Two pale blue star flowers on a dense green mat of small leaves, growing in a crack in lichen-covered granite
FlowerUS Forest ServicePublic domain

About the plant

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

Habit
perennial or subshrubPlants of the World Online
Habit
Perennial, Forb/herbPLANTS Database
Flower
White, pale blueWikipedia
Native range
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

  • The Castle Crags bellflower is named for Castle Crags, a mountain formation in its small range in the Shasta-Trinity National Forest. It is known from fewer than ten occurrences in California. Wikipedia: Campanula shetleri

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

  1. Sow outdoors and leave it

    Up in late March through April.

No stated waiting before sowing.

67% germination.

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

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Campanula p. 21Public domain
Show the original text
Campanula (Campanulaceae). C. shetleri germ. 40-70D(2/5 in 2nd w), 70D-40,-70D{none), 70L-40-70L(1/8 on 4th d), and OT(6/9 in late March through April). •
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Campanula p. 21. 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, 1998

Difficulty Moderate Rated by us, not by the source.

Start around December 22, 2026 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

about 3 months from start to step 2. Germination happens during step 2, in 14 days.

40% germination in 14 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Campanula p. 21Public domain
Show the original text
Campanula (Campanulaceae). C. shetleri germ. 40-70D(2/5 in 2nd w), 70D-40,-70D{none), 70L-40-70L(1/8 on 4th d), and OT(6/9 in late March through April). •
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Campanula p. 21. 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, 1998

Difficulty High Rated by us, not by the source.

Start around October 4, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 3, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: light

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: light

about 6 months from start to step 3. Germination happens during step 3, in 4 days.

12% germination in 4 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Campanula p. 21Public domain
Show the original text
Campanula (Campanulaceae). C. shetleri germ. 40-70D(2/5 in 2nd w), 70D-40,-70D{none), 70L-40-70L(1/8 on 4th d), and OT(6/9 in late March through April). •
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Campanula p. 21. 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