Pansies prefer well-drained soil rich in organic matter. In hardiness zones with milder winters, fall planting allows pansies to establish roots and sometimes bloom throughout the winter season. Planting pansies outside at this time helps you avoid stress and setbacks, giving them the healthy start they need to thrive. Typically grown as a cool-weather annual or biennial, pansies provide color when many other garden plants are dormant. · timing can be a crucial factor when it comes to getting your pansies started off right. · these flowers are hardy in cool temperatures, making early spring and fall the best times for planting. Achieving the best results depends on selecting an environment that accommodates their specific needs for temperature, light, and soil. This is the best season to plant pansies. If you plant your pansies in baskets, pots, or borders in september they will grow quickly, producing vigorous roots and bushy foliage. · fall is the best time to plant pansies. We put together this guide to discuss some important factors to consider when choosing when to plant your pansies. · the best time when you can plant pansies outside is in early spring when frost risk has passed, soil is warm, and getting set up for a season of strong growth. Wait for the soil to cool down sufficiently before planting to avoid weak growth and susceptibility to cold, diseases, and pests. To summarize, the timing for planting pansies outside depends on the cooling of the summer soil. Viola x wittrockiana, commonly known as the pansy , is a popular flowering plant known for its vibrant, “face-like” blooms. For best results, prepare the planting bed with a 3 to 4 inch (8-10 cm. ) layer of organic material, like compost or peat moss. · from mid- september to early october , your soil and compost are warm enough from the autumn sunshine.