This plant is in a pot on a balcony. It is a perennial that survives below freezing temps. It produces small white flowers terminally from time to time. The plant needs little care. I would like the identification, and the owner has no idea.

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This plant is in a pot on a balcony. It is a perennial that survives below freezing temps. It produces small white flowers terminally from time to time. The plant needs little care. I would like the identification, and the owner has no idea.
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