Answer: Impatiens will bloom continuously over a long season, so there's no particular time to begin looking for seed pods. Watch the flowers after the petals fall and you'll see a swollen pod at the end of the stem. When it's ripe, and you touch it, the seeds will scatter over a wide area. You might try picking the still green seed pods and placing them in an envelope to dry. At least that way you'll confine the seeds to one area.
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