Answer: From your description of the monster impatiens, I'd guess you're not dealing with the common annual bedding variety, but with the perennial Impatiens wallerana. This Busy Lizzie is a rapid, vigorous grower with narrow glossy green leaves and flowers 1"-2" wide in scarlet, pink, rose, violet, orange or white. The tops of this impatiens will freeze down in the winter, but the roots are hardy and will send up new stems in the spring.
You can collect seeds to plant next year or simply cut the stems back to 6" above the ground when the weather turns cold. Either way, you're assured of having new plants next season.
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