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Galeopsis speciosa

Bee Hemp-nettle · Edmonton Hempnettle · Large Hemp-nettle

Family LamiaceaeGenus Galeopsis

Two dew-covered two-lipped flowers, cream above and purple-blotched below, on a hairy square stem
FlowerIvar LeidusCC BY-SA 4.0

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
Cream, purpleRead from the photograph on this page
Native range
Albania, Altay, Austria, Baltic States, Belarus, Belgium and elsewhereGBIF 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; Read from the photograph on this page — Deno's Garden; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

Worth knowing

  • The large-flowered hemp-nettle, native to northern and central Europe and Siberia, has become a widespread introduced weed in Canada. It is also called Edmonton hempnettle. The plant is poisonous and causes paralysis. Wikipedia: Galeopsis speciosa

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

Start around December 15, 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 21 days.

33% germination in 21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Galeopsis p. 35Public domain
Show the original text
Galeopsis (Lamiaceae). G. speciosa germ. 40-70D(2/6 in 3rd w) and none in 70D-40-70D or 70L-40-70D. A second sample germ. 70D-40-70D(2/6 on 2nd d).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Galeopsis p. 35. 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 High Rated by us, not by the source.

Start around October 6, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 5, 2026.

  1. Warm moist stratification

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

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

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

about 6 months from start to step 3. Germination happens during step 3, in 2 days.

33% germination in 2 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Galeopsis p. 35Public domain
Show the original text
Galeopsis (Lamiaceae). G. speciosa germ. 40-70D(2/6 in 3rd w) and none in 70D-40-70D or 70L-40-70D. A second sample germ. 70D-40-70D(2/6 on 2nd d).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Galeopsis p. 35. 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

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing.

0% germination.

Nothing germinated at 70.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Galeopsis p. 35Public domain
Show the original text
Galeopsis (Lamiaceae). G. speciosa germ. 40-70D(2/6 in 3rd w) and none in 70D-40-70D or 70L-40-70D. A second sample germ. 70D-40-70D(2/6 on 2nd d).
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Galeopsis p. 35. Quoted exactly. Every value on this card comes from this record; 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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