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Thalictrum rochebrunnianum

Lavender Mist Meadow Rue

Family RanunculaceaeGenus Thalictrum

Sprays of lilac flowers with pale yellow stamens on fine dark stalks, above broad green foliage.
Flowerpeganum from Henfield, EnglandCC BY-SA 2.0

About the plant

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

Flower
VioletWikipedia

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Source: Wikipedia — Wikipedia contributors.

Worth knowing

  • Lavender mist meadow rue, from Korea and Japan, can reach 2 m, topped with a loose spray of small violet flowers with yellow stamens. It holds the RHS Award of Garden Merit. Wikipedia: Thalictrum rochebruneanum

Two sources report 5 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Moderate Rated by us, not by the source.

Start around October 2, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 1, 2026.

  1. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

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

80% germination in 6 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Thalictrum p. 81Public domain
Show the original text
Thalictrum (Ranunculaceae). Most of the species in this genus have a GA-3 requirement for germination and most die quickly in DS. T. rochebrunianum will ultimately germinate without GA-3 if given sufficiënt cycles. The data are 70 GA-3(81% in 2nd w), 70-40-70(80% on 6th d), and 70% in April in OT from sowing the previous September. DS for 6 m at 70 did not affect the germination in 70 GA-3.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Thalictrum p. 81. 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.

Sow around September 2027 — a date the source gives, not one counted back from a May 3 last frost. Too late for spring 2027 — that needed starting on September 2026.

  1. Sow outdoors and leave it

    Sown outdoors in September; up in April.

No stated waiting before sowing. Then 210 days to germinate.

70% germination in 210 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Thalictrum p. 81Public domain
Show the original text
Thalictrum (Ranunculaceae). Most of the species in this genus have a GA-3 requirement for germination and most die quickly in DS. T. rochebrunianum will ultimately germinate without GA-3 if given sufficiënt cycles. The data are 70 GA-3(81% in 2nd w), 70-40-70(80% on 6th d), and 70% in April in OT from sowing the previous September. DS for 6 m at 70 did not affect the germination in 70 GA-3.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Thalictrum p. 81. 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, 1993

Difficulty Moderate Rated by us, not by the source.

Start around December 22, 2026 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

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

95% germination in 14 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Thalictrum p. 220Public domain
Show the original text
Thalictrum (Ranunculaceae). Germination in this genus was found to be dramatically stimulated by GA-3. The seedlings are normal and healthy. This is a great benefit because otherwise germination is low and much extended in most of the species. In general DS is not tolerated. Light was not used in this genus. T. rochebrunianum requires GA-3 or outdoor treatment. Seeds germ. 70 GA- 3(81% in 2nd w) and 40-70 GA-3(95% in 2nd w). DS 6 m at 70 had no effect. The seedlings from GA-3 treatment were normal. Seeds placed outdoors in September germ. 95% in April. All other treatments failed.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Thalictrum p. 220. 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, 1993

Difficulty Low Rated by us, not by the source.

Sow around September 2027 — a date the source gives, not one counted back from a May 3 last frost. Too late for spring 2027 — that needed starting on September 2026.

  1. Sow outdoors and leave it

    Sown outdoors in September; up in April.

No stated waiting before sowing. Then 210 days to germinate.

95% germination in 210 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Thalictrum p. 220Public domain
Show the original text
Thalictrum (Ranunculaceae). Germination in this genus was found to be dramatically stimulated by GA-3. The seedlings are normal and healthy. This is a great benefit because otherwise germination is low and much extended in most of the species. In general DS is not tolerated. Light was not used in this genus. T. rochebrunianum requires GA-3 or outdoor treatment. Seeds germ. 70 GA- 3(81% in 2nd w) and 40-70 GA-3(95% in 2nd w). DS 6 m at 70 had no effect. The seedlings from GA-3 treatment were normal. Seeds placed outdoors in September germ. 95% in April. All other treatments failed.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Thalictrum p. 220. 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, 1993

Difficulty Low Rated by us, not by the source.

Start around March 22, 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 14 days to germinate.

81% germination in 14 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Thalictrum p. 220Public domain
Show the original text
Thalictrum (Ranunculaceae). Germination in this genus was found to be dramatically stimulated by GA-3. The seedlings are normal and healthy. This is a great benefit because otherwise germination is low and much extended in most of the species. In general DS is not tolerated. Light was not used in this genus. T. rochebrunianum requires GA-3 or outdoor treatment. Seeds germ. 70 GA- 3(81% in 2nd w) and 40-70 GA-3(95% in 2nd w). DS 6 m at 70 had no effect. The seedlings from GA-3 treatment were normal. Seeds placed outdoors in September germ. 95% in April. All other treatments failed.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Thalictrum p. 220. 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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