For more information consult HGIC 2105, Pansy Problems . Pansies thrive in cool weather. They will bloom any time that the temperature is above freezing. Their peak bloom is in spring. They fade and should be discarded with the start of hot summer weather.
Pansies grow best in a location that receives morning sun and has rich, well-draining organic soil.
Add manure, leaf mold or compost to soil to increase organic content. Sow seed indoors in late summer, six to eight weeks before transplanting. The pansies can be transplanted into the garden once the summer heat has been broken and cooler weather arrives. If you purchase plants, choose ones that are stocky with dark green foliage and have few blooms but many buds. Water well after planting and continue to water through the fall and winter any time that less than an inch of rain falls during the week.