Onosma stellulata

Difficulty Low Rated by us, not by the source.

Start around January 25, 2027 for a May 3 last frost.

1. 1

   Cold moist stratification

   Temperature: 40°F 4°C

No stated waiting before sowing. Then 70 days to germinate.

100% germination in 56–70 days.

Every seed of eight. Sow it cold and wait two months.

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

   One seed of seven, on the sixth day. Deno gives no length for this period; three months is his standard cycle.

2. 2

   Cold moist stratification

   Temperature: 40°F 4°C

   Five of seven, in the eighth week.

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

71% germination in 56 days.

One seed comes up warm, five more in the cold that follows. Simply sowing cold does better.

This source doesn't state how long.