Green leaves turning dark purple and twisting while remaining healthy is not typical of any common indoor plant. It may be a light-stress response, a cultivar-specific trait, or a misinterpretation.
Email clear photos to wcreed@HorticulturalHelp.com:
With a photo, I can identify it and advise on care.
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Mystery Houseplant: Leaves Turning Green After Repotting
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White Oak Losing Green Leaves in Spring: Seeking Expert Diagnosis
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Identifying Trees by Leaf Characteristics
False Aralia (Dizygotheca elegantissima): Care for a Finicky Beauty
Money Tree (Pachira) Leaves Turning Pale/White: Sunburn and Low Humidity
Identifying a Tree Seedling with Catkins in Alabama: Balsam Poplar?
Mystery Plant in an Alaskan Greenhouse: Chaste Tree or Weed?
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