In Mild Winter Climates, start seeds in late summer to have plants large enough to successfully overwinter and bloom in early spring.
In Cold Winter Climates, start early indoors about 2 1/2 months before last spring frost. Sow seeds in a container of seed starting mix 1 inch apart and cover very lightly. Keep evenly moist and cool 55-60°(13-16°C), providing a strong light source. When seedlings are large enough to handle, transplant 2 inches apart into a deeper container(s) and grow to 2 to 3 inches tall. Gradually acclimate seedlings to outdoor conditions before transplanting 4 to 5 inches apart in a sunny spot.
Space seedlings 4 to 5 inches apart.
Pansies will bloom longest and make largest flowers when weather is cool. In mild winter areas, late summer sowings will begin to bloom in very early spring or even late winter. Keep faded blossoms removed to prolong flowering.