planting Dutchman’s breeches

Question

How deep should I plant the Dutchman’s breeches seeds?

Answer 1

This is a difficult plant to start from seed.
Seeds must be fresh and need a warm moist period, following by a cool moist period.
Mix seeds with sterile medium and place in a sealed plastic bag in 80 degree location for 60 to 90 days.
Then place in the refrigerator for another 60 to 90 days before sowing.

https://www.gardeningknowhow.com/ornamental/flowers/dutchmans-breeches/dutchmans-breeches-wildflower.htm