Onosma taurica

Difficulty Moderate Rated by us, not by the source.

Start around October 27, 2026 for a May 3 last frost.

1. 1

   Cold moist stratification

   Duration: 90 days · Temperature: 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.

2. 2

   Warm moist stratification

   Temperature: 70°F 21°C

   Two more of seven, on the fourth day.

about 3 months from start to sowing. Then 70 days to germinate.

43% germination in 70 days.

Three of seven in the cold, two more within four days of the move to 70.

This source doesn't state how long.

Difficulty Moderate Rated by us, not by the source.

Start around November 10, 2026 for a May 3 last frost.

1. 1

   Warm moist stratification

   Duration: 90 days · Temperature: 70°F 21°C

   Deno gives no length for this period; three months is his standard cycle.

2. 2

   Cold moist stratification

   Temperature: 40°F 4°C

   Three of seven, in the eighth week.

about 3 months from start to sowing. Then 56 days to germinate.

43% germination in 56 days.

Warm first gives the same three of seven, and loses the extra two.

This source doesn't state how long.