Directly Sowing: If directly sowing outdoors, plant Siberian Wallflower after the first hard frost in early Spring to cold-stratify seeds. Plants will germinate in late Spring when the soil warms to at least 60F.
Directly Sowing: If directly sowing outdoors, plant Siberian Wallflower after the first hard frost in early Spring to cold-stratify seeds. Plants will germinate in late Spring when the soil warms to at least 60F.