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1 You can start pansy seeds indoors 6 to 8 weeks before you plan on transplanting them. 2  Plant seeds in late winter for early spring and summer flowering, or plant seeds in the summer for winter flowering. 3  Plant in moist, humus-rich, well-drained soil.4  Pansies like sun and cooler temperatures. Plant in moist, humus-rich, well-drained soil. 2  Pansies like sun and cooler temperatures. 3  Space the plants about 7 to 12 inches apart. 4  They will spread about 9 to 12 inches and grow to be about 6 to 9 inches tall.
Perennial Pansies. In warmer climates, perennial pansies can be grown year long. These delicate flowers are actually quite hardy and freeze resistant. When grown during the winter in warmer climates, they will bloom from fall planting until warmer weather surface in spring.hey are low growing plants of about 8 tall and make wonderful flowers for window boxes. Perennial pansies come in many color combinations, purple and yellow, purple and white, red and yellow, shades of blue-the list goes on and on.