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Wahlenbergia gloriosa

Royal Bluebell

Family CampanulaceaeGenus Wahlenbergia

A deep blue-violet flower of five pointed lobes seen close, with a white style standing at its dark center.
FlowerNathanHurst at English WikipediaCC BY-SA 3.0

About the plant

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

Habit
perennialPlants of the World Online
Flower
PurpleWikipedia
Native range
New South Wales, VictoriaGBIF 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; Wikipedia — Wikipedia contributors; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

Two sources report 9 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

Start around December 28, 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: light

about 3 months from start to step 2. Germination happens during step 2, in 8 days.

100% germination in 5–8 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Wahlenbergia p. 67Public domain
Show the original text
Wahlenbergia (Campanulaceae). Generally light was required for . germination. It would help if this could be studied as a function of time of DS. W. gloriosa DS 6 m germ. 31-43% in 70D, 70L, and 70 GA-3 (1st Suppl.). It is now found that this was unchanged.by a prior 3 m at 40. A second sample germ. 70L(20% in 2-4 w), 70D(17% in 2-5 w), 40-70L(100% in 5-8 d), and 40-70D(18% in 8- 11 d). When this last.sample was shifted to 70L after.5 w, 6% more germ. in 5-9 d. After 1 y DS seeds germ. 70L(60% in 1-3 w) and 70D(15% in 2nd w). The seeds are small, and it is difficult to detect empty seed coats making germination counts unreliable. My finaf conclusion is that there is some initiation of germination by light, and this conclusion is in accord with the more clear cut results on the other species studied.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Wahlenbergia p. 67. 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 March 16, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 15, 2026.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 12 months from start to sowing. Then 21 days to germinate.

60% germination in 7–21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Wahlenbergia p. 67Public domain
Show the original text
Wahlenbergia (Campanulaceae). Generally light was required for . germination. It would help if this could be studied as a function of time of DS. W. gloriosa DS 6 m germ. 31-43% in 70D, 70L, and 70 GA-3 (1st Suppl.). It is now found that this was unchanged.by a prior 3 m at 40. A second sample germ. 70L(20% in 2-4 w), 70D(17% in 2-5 w), 40-70L(100% in 5-8 d), and 40-70D(18% in 8- 11 d). When this last.sample was shifted to 70L after.5 w, 6% more germ. in 5-9 d. After 1 y DS seeds germ. 70L(60% in 1-3 w) and 70D(15% in 2nd w). The seeds are small, and it is difficult to detect empty seed coats making germination counts unreliable. My finaf conclusion is that there is some initiation of germination by light, and this conclusion is in accord with the more clear cut results on the other species studied.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Wahlenbergia p. 67. 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 March 8, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 28 days to germinate.

20% germination in 14–28 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Wahlenbergia p. 67Public domain
Show the original text
Wahlenbergia (Campanulaceae). Generally light was required for . germination. It would help if this could be studied as a function of time of DS. W. gloriosa DS 6 m germ. 31-43% in 70D, 70L, and 70 GA-3 (1st Suppl.). It is now found that this was unchanged.by a prior 3 m at 40. A second sample germ. 70L(20% in 2-4 w), 70D(17% in 2-5 w), 40-70L(100% in 5-8 d), and 40-70D(18% in 8- 11 d). When this last.sample was shifted to 70L after.5 w, 6% more germ. in 5-9 d. After 1 y DS seeds germ. 70L(60% in 1-3 w) and 70D(15% in 2nd w). The seeds are small, and it is difficult to detect empty seed coats making germination counts unreliable. My finaf conclusion is that there is some initiation of germination by light, and this conclusion is in accord with the more clear cut results on the other species studied.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Wahlenbergia p. 67. 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 4

DerivedN. C. Deno, 1998

Difficulty High Rated by us, not by the source.

Start around December 25, 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 11 days.

18% germination in 8–11 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Wahlenbergia p. 67Public domain
Show the original text
Wahlenbergia (Campanulaceae). Generally light was required for . germination. It would help if this could be studied as a function of time of DS. W. gloriosa DS 6 m germ. 31-43% in 70D, 70L, and 70 GA-3 (1st Suppl.). It is now found that this was unchanged.by a prior 3 m at 40. A second sample germ. 70L(20% in 2-4 w), 70D(17% in 2-5 w), 40-70L(100% in 5-8 d), and 40-70D(18% in 8- 11 d). When this last.sample was shifted to 70L after.5 w, 6% more germ. in 5-9 d. After 1 y DS seeds germ. 70L(60% in 1-3 w) and 70D(15% in 2nd w). The seeds are small, and it is difficult to detect empty seed coats making germination counts unreliable. My finaf conclusion is that there is some initiation of germination by light, and this conclusion is in accord with the more clear cut results on the other species studied.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Wahlenbergia p. 67. 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 5

DerivedN. C. Deno, 1998

Difficulty High Rated by us, not by the source.

Start around March 1, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 35 days to germinate.

17% germination in 14–35 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Wahlenbergia p. 67Public domain
Show the original text
Wahlenbergia (Campanulaceae). Generally light was required for . germination. It would help if this could be studied as a function of time of DS. W. gloriosa DS 6 m germ. 31-43% in 70D, 70L, and 70 GA-3 (1st Suppl.). It is now found that this was unchanged.by a prior 3 m at 40. A second sample germ. 70L(20% in 2-4 w), 70D(17% in 2-5 w), 40-70L(100% in 5-8 d), and 40-70D(18% in 8- 11 d). When this last.sample was shifted to 70L after.5 w, 6% more germ. in 5-9 d. After 1 y DS seeds germ. 70L(60% in 1-3 w) and 70D(15% in 2nd w). The seeds are small, and it is difficult to detect empty seed coats making germination counts unreliable. My finaf conclusion is that there is some initiation of germination by light, and this conclusion is in accord with the more clear cut results on the other species studied.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Wahlenbergia p. 67. 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 6

DerivedN. C. Deno, 1998

Difficulty High Rated by us, not by the source.

Start around March 23, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 22, 2026.

  1. Dry storage

    Duration: 365 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: dark

about 12 months from start to sowing. Then 14 days to germinate.

15% germination in 14 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Wahlenbergia p. 67Public domain
Show the original text
Wahlenbergia (Campanulaceae). Generally light was required for . germination. It would help if this could be studied as a function of time of DS. W. gloriosa DS 6 m germ. 31-43% in 70D, 70L, and 70 GA-3 (1st Suppl.). It is now found that this was unchanged.by a prior 3 m at 40. A second sample germ. 70L(20% in 2-4 w), 70D(17% in 2-5 w), 40-70L(100% in 5-8 d), and 40-70D(18% in 8- 11 d). When this last.sample was shifted to 70L after.5 w, 6% more germ. in 5-9 d. After 1 y DS seeds germ. 70L(60% in 1-3 w) and 70D(15% in 2nd w). The seeds are small, and it is difficult to detect empty seed coats making germination counts unreliable. My finaf conclusion is that there is some initiation of germination by light, and this conclusion is in accord with the more clear cut results on the other species studied.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Wahlenbergia p. 67. 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 7

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 20, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 16 days to germinate.

43% germination in 8–16 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Wahlenbergia p. 86Public domain
Show the original text
Wahlenbergia (Campanulaceae). W. gloriosa germ. 70D(43% in 8-16 d), 70L(34% in 8-16 d), and 70 GA-3(31% in 8-16 d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Wahlenbergia p. 86. 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 8

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 20, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 16 days to germinate.

34% germination in 8–16 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Wahlenbergia p. 86Public domain
Show the original text
Wahlenbergia (Campanulaceae). W. gloriosa germ. 70D(43% in 8-16 d), 70L(34% in 8-16 d), and 70 GA-3(31% in 8-16 d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Wahlenbergia p. 86. 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 9

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around March 20, 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 16 days to germinate.

31% germination in 8–16 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Wahlenbergia p. 86Public domain
Show the original text
Wahlenbergia (Campanulaceae). W. gloriosa germ. 70D(43% in 8-16 d), 70L(34% in 8-16 d), and 70 GA-3(31% in 8-16 d).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Wahlenbergia p. 86. 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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