Onosma taurica
Golden-flowered Onosma
About the plant
What it is and where it grows — not part of any germination protocol.
- Habit
- perennialPlants of the World Online
- Flower
- YellowRead from the photograph on this page
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; Read from the photograph on this page — Deno's Garden.
This source reports two treatments. Both are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty Moderate
Start around October 28, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on October 27, 2026.
Cold moist stratification
Duration: 90 daysTemperature: 40°F 4°C
Three seeds of seven, in the tenth week. Deno gives no length for this period; three months is his standard cycle.
Warm moist stratification
Temperature: 70°F 21°C
Two more of seven, on the fourth day.
about 3 months from start to step 2. Germination happens during step 2, in 70 days.
43% germination in 70 days.
Three of seven in the cold, two more within four days of the move to 70.
Protocol 2
DerivedN. C. Deno, 1993Difficulty Moderate
Start around November 10, 2026 for a May 3 last frost.
Warm moist stratification
Duration: 90 daysTemperature: 70°F 21°C
Deno gives no length for this period; three months is his standard cycle.
Cold moist stratification
Temperature: 40°F 4°C
Three of seven, in the eighth week.
about 3 months from start to step 2. Germination happens during step 2, in 56 days.
43% germination in 56 days.
Warm first gives the same three of seven, and loses the extra two.
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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