If they are in containers, they can be brought inside for the winter. Give them more sunlight indoors. If they begin to get leggy, pinch them back and you should enjoy blooms indoors. If grown outside, after a killing frost, scatter the spent flowers and shake the plants on the soil to scatter the remaining seeds. Next spring, they should reappear from the seeds.
Many people have volunteer impatiens each season, and never replant again.
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